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| Meta Title | 10 of the Rarest Mental Health Disorders | Private Therapy Clinic |
| Meta Description | There are mental health disorders rarely talked about in the mainstream. Curious? Keep reading to discover the full list. |
| Meta Canonical | null |
| Boilerpipe Text | We all have a pretty good idea of what mental health disorders like depression and anxiety look like. Approximately 13% of the worldās population suffer from some kind of mental disorder. Thatās roughly 971 million people. But did you know thereās actually an entire spectrum of mental health disorders that are far removed from what you hear about in the mainstream they seem like the stuff fantasy?
Here are ten rare mental health disorders you never heard ofā¦
1. Alice in Wonderland Syndrome
And in many ways, thisĀ
is
Ā really drawing on the fantastical. Although it has no direct link to the actual source material, Alice in Wonderland Syndrome is very real and causes you to experience temporary episodes of distorted perception and disorientation. The name comes from the fact you may feel either larger or smaller than you really are⦠The room youāre in may also seem to shift and feel either closer or further away than it really is. But these arenāt hallucinations. These experiences are caused by changes in how your brain perceives your environment. And it doesnāt just affect your perception ā it canĀ
and
does affect multiple senses and that includes your vision, touch, and hearing. Time can also become distorted as well ā either speeding up or slowing down. It tends only to affect young adults, as most people tend to grow out of it by the time they reach adulthood. Although cases still arenāt totally unheard ofā¦
2. Erotomania
AKA de Clerambault Syndrome falls in the category of delusional disorders. In other words, itās a form of psychosis, which, in this case, leads people to believe that a figure who isnāt in their life ā and they may never even have met before ā is in love with them. In many cases, this can be a public figure or celebrity. And while it isĀ
definitely
Ā the work of fantasy and infatuation with no real grounding, the people having these āfeelingsā believe theyāreĀ
absolutely
real. The actual cause of the condition isnāt exactly clear, and as with all mental health disorders the way it manifests will be very circumstantial and dependent on that personās environmental influences, current mental state and baseline personality. In the cases that
haveĀ
been recorded, it was discovered that erotomania isnāt a static condition. It
Ā canĀ
present by itself, but itās also be shown to present as a symptom of more serious mental health disorders such as:
Schizophrenia
Major Depressive Disorder
Bipolar
Alzheimerās
Some psychologists have even suggested that social media platforms such as Twitter, Instagram and YouTube can exacerbate the condition, as it breaks down the barrier between people who would otherwise be disconnected. It creates a false sense of kinship, and a sense of connection that the emotional vulnerable latch onto in their time of need. This has been backed up by several studies that suggest the attachment observed in erotomania is a form of coping mechanism for managing severe stress.
3. Alien Hand Syndrome
Now, keeping on the theme of fantasy, weāre venturing into the realms of sci-fi with this one. Alien hand syndrome is a neurological condition that causes your hand to act of its own free will. Basically, the hand acts free of the mind and will move completely independently and out of sync with what the rest of the body is trying to do. It can make the hand feel as though itās not a part of the body and like itās a foreign object. Hence the name⦠And although it can affect children, cases are mostly confined to adults. It can also be referred to as Dr Strangelone syndrome, Strangelovian hand, or archaic hand. As for how itās caused⦠There are several factors at play. Some of the main causes include:
Development as a side effect of a stroke, trauma, or tumour
An effect of some types of cancer
Neurodegenerative disease
Brain aneurysms
And some of the symptoms include:
The inability to control the hand
The affected hand trying to perform goal-directed tasks or actions
The hand moving without cognitive input or awareness
Engaging in self-oppositional tasks (i.e closing a door you just opened)
Being uncooperative with tasks that require both hands
4. Factitious DisorderĀ
People who suffer from this condition will deliberately attempt to fabricate signs of physical illness or injury to receive medical treatment and/or care and attention within a medical setting. And thatās the goal here, thereās no practical benefit from receiving attention. Itās mainly psychological. Although in some cases, people will receive unnecessary surgeries. But thatās not to take anything away from its seriousness. Those who experience it often endure quite severe emotional difficulties and are at high risk of attempting to harm themselves so they can gain more treatment. There are two types of factitious disorder:
The first is:
Self-imposed factious disorder:
This involves falsifying psychological or physical symptoms. So for example, a person may mimic behaviour typical of letās say schizophrenia. Theyāll report all the associated signs and symptoms. But theyāll actually experience none of them.
Factitious Disorder Imposed on another:
People with this variant will produce or fabricate symptoms of those whoāre under their care. So, for example, elderly people, children, or the disabled. It most often occurs in motherās who may harm their child to gain attention.
Factitious disorder tends to affect less than 0.5% of the population.
5. Capgras Syndrome
Also known as āimposter syndromeā or Capgras Delusion. People with this mental health condition believe that someone in their life that plays a significant role what been replaced with an imposter. And this inevitably leads them to accuse āsaid-person,ā whether it be a relative, friend, or co-worker of not being who they are mean to be. Again, as with erotomania, it can present as an individuated case. But itās also been known to present as a symptom of:
Alzheimerās
Dementia
Schizophrenia
Epilepsy
However, thereās still no agreed-upon cause of how Capgras syndrome develops. Some researchers believe itās a neurological issue in the brain, caused by either atrophy, lesions, or cerebral dysfunction. While, on the other hand, others believe that itās a combination of physical and cognitive changes. With yet another theory stating itās a problem with perception linked to damaged or missing memories.
6. Apotemnophilia
And this one might send a few shivers up your spine⦠If youāre unfamiliar with the condition, Apotemnophilia also known as body integrity disorder or amputee identity disorder is a neurological condition. Its defining characteristic is the overwhelming desire to either amputate or damage healthy parts of the body, which can also be known as āself-demand amputation.ā Compared to the other mental health disorders on this list, there isnāt a great deal thatās known about it. The first known case that was reported dates back to 1933 in medical journals citing, āerotically-obsessed persons who wanted to become amputees themselves.ā The firt actual scientific report only appeared in 1977. The cause is still unknown at this point, although itās speculated that it could be a result of psychiatric etiology, which refers to a āpathological desire driven by sexual compulsion.ā However, recent developments have also offered a neurological explanation, which says the condition could be the result of dysfunction within the right parietal lobe.
7. Stendhal Syndrome
The next condition is perhaps something that might be used as a gag in a sitcom. But it is, however, a very real thing. Stendhal Syndrome is describe someone who experiences
Physical and or emotional anxiety
,
Panic attacks
,
Dissociate experiencesĀ
Hallucinations
When exposed to art⦠But not just any art⦠The symptoms are most often triggers by āart that is perceived as particularly beautiful or when the individual is exposed to large quantities of art that are concentrated in a single place.ā So for that, read:
Museums
Gallerys
Exhibitions
Surprisingly, the syndrome has a fairly long history and was first coined in 1989 by an Italian psychiatrist, although reports of artwork causing distress date all the way back to the 1800s.
8. Visual Snow Syndrome
Also, known as visual static or persistent positive visual phenomena. It describes a condition that will cause you to see continuous flickering white dots within your entire field of vision. These are the snow or static we just mentioned. These dots are usually blank and white, but also present as flashing, colour or even transparent.
The visual symptoms include:
Floaters
Flashes of light
Compromised night vision
Colour swirls
A consistent imprinted image
Sensitivity to light.
And then thereās alas a non-visual set of symptoms, which include:
Migraines
Tinnitus (Ringing in the ears)
Vertigo
Fatigue
Tremors
Anxiety
Depression
No one is entirely certain how this condition develops, but the best research done so far, indicates itās perhaps a complex neurological condition. As for recorded cases, there isnāt a great deal of information with it being such a new diagnosis. And to date, there have only been around 200 cases worldwide
9. Folie a Deux
Folie a Deux is almost like something from a supernatural thriller. Also known as shared delusion or shared psychotic disorder, it occurs when an otherwise mental stable person takes on the symptoms of someone close to them whoās suffering from a psychotics disorder such as schizophrenia. For example, letās say your partner has a psychotic disorder, which causes her to think that sheās being haunted by ghosts. If you have shared decisional disorder, you too will believe that youāre also being haunted by ghosts. However, the condition only tends to occur in long-term relationships in which the person with the psychotic disorder is dominant and the other partner is passive.
Shared psychotic disorders have also been known to happen in groups where thereās close involvement with a psychotic person. This variant is called folie a plusiers or the āthe madness of many.ā An example of this would be if a cult leader happened to be psychotic, his followers may then take on his/her delusions.
10. Reduplicative Amnesia
Reduplicative Amnesia is very similar to Capgras syndrome. But in this case, instead of believing that people have been replaced with doubles, in those with Reduplicative Amnesia, they believe that their entire location has been duplicated. The way this manifests can vary, and itās often been attributed to severe head trauma that creates a dissociate-type effect between the individual and their environment. The condition was first documented back in 1903 by psychiatrist Arnold Pick, with a patient with suspected Alzheimerās. The woman in question insisted that sheād been moved from Pickās city clinic to one that was identical but located in a familiar suburb. Today, the condition is sometimes observed in people who may be suffering from:
Alzheimerās
Brain Tumours
Dementia
Brian Injury
Psychiatric disorders |
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# 10 of the Rarest Mental Health Disorders (And What They Look Like)
1. [Home](https://theprivatetherapyclinic.co.uk/)
2. [Blog](https://theprivatetherapyclinic.co.uk/blog/)
3. 10 of the Rarest Mental Health Disorders (And What They Look Like)
Table of Contents
- 1\. Alice in Wonderland Syndrome
- 2\. Erotomania
- 3\. Alien Hand Syndrome
- 4\. Factitious Disorder
- 5\. Capgras Syndrome
- 6\. Apotemnophilia
- 7\. Stendhal Syndrome
- 8\. Visual Snow Syndrome
- 9\. Folie a Deux
- 10\. Reduplicative Amnesia
[View all](https://theprivatetherapyclinic.co.uk/blog/10-of-the-rarest-mental-health-disorders/)

We all have a pretty good idea of what mental health disorders like depression and anxiety look like. Approximately 13% of the worldās population suffer from some kind of mental disorder. Thatās roughly 971 million people. But did you know thereās actually an entire spectrum of mental health disorders that are far removed from what you hear about in the mainstream they seem like the stuff fantasy?
Here are ten rare mental health disorders you never heard ofā¦
## 1\. Alice in Wonderland Syndrome
And in many ways, this *is* really drawing on the fantastical. Although it has no direct link to the actual source material, Alice in Wonderland Syndrome is very real and causes you to experience temporary episodes of distorted perception and disorientation. The name comes from the fact you may feel either larger or smaller than you really are⦠The room youāre in may also seem to shift and feel either closer or further away than it really is. But these arenāt hallucinations. These experiences are caused by changes in how your brain perceives your environment. And it doesnāt just affect your perception ā it can *and* does affect multiple senses and that includes your vision, touch, and hearing. Time can also become distorted as well ā either speeding up or slowing down. It tends only to affect young adults, as most people tend to grow out of it by the time they reach adulthood. Although cases still arenāt totally unheard ofā¦
## 2\. Erotomania
AKA de Clerambault Syndrome falls in the category of delusional disorders. In other words, itās a form of psychosis, which, in this case, leads people to believe that a figure who isnāt in their life ā and they may never even have met before ā is in love with them. In many cases, this can be a public figure or celebrity. And while it is *definitely* the work of fantasy and infatuation with no real grounding, the people having these āfeelingsā believe theyāre *absolutely* real. The actual cause of the condition isnāt exactly clear, and as with all mental health disorders the way it manifests will be very circumstantial and dependent on that personās environmental influences, current mental state and baseline personality. In the cases that *have* been recorded, it was discovered that erotomania isnāt a static condition. It *can* present by itself, but itās also be shown to present as a symptom of more serious mental health disorders such as:
- [Schizophrenia](https://theprivatetherapyclinic.co.uk/issues/paranoia/)
- [Major Depressive Disorder](https://theprivatetherapyclinic.co.uk/issues/depression/)
- [Bipolar](https://theprivatetherapyclinic.co.uk/issues/bipolar-disorder/)
- Alzheimerās
Some psychologists have even suggested that social media platforms such as Twitter, Instagram and YouTube can exacerbate the condition, as it breaks down the barrier between people who would otherwise be disconnected. It creates a false sense of kinship, and a sense of connection that the emotional vulnerable latch onto in their time of need. This has been backed up by several studies that suggest the attachment observed in erotomania is a form of coping mechanism for managing severe stress.
## 3\. Alien Hand Syndrome
Now, keeping on the theme of fantasy, weāre venturing into the realms of sci-fi with this one. Alien hand syndrome is a neurological condition that causes your hand to act of its own free will. Basically, the hand acts free of the mind and will move completely independently and out of sync with what the rest of the body is trying to do. It can make the hand feel as though itās not a part of the body and like itās a foreign object. Hence the name⦠And although it can affect children, cases are mostly confined to adults. It can also be referred to as Dr Strangelone syndrome, Strangelovian hand, or archaic hand. As for how itās caused⦠There are several factors at play. Some of the main causes include:
- Development as a side effect of a stroke, trauma, or tumour
- An effect of some types of cancer
- Neurodegenerative disease
- Brain aneurysms
And some of the symptoms include:
- The inability to control the hand
- The affected hand trying to perform goal-directed tasks or actions
- The hand moving without cognitive input or awareness
- Engaging in self-oppositional tasks (i.e closing a door you just opened)
- Being uncooperative with tasks that require both hands
## 4\. Factitious Disorder
People who suffer from this condition will deliberately attempt to fabricate signs of physical illness or injury to receive medical treatment and/or care and attention within a medical setting. And thatās the goal here, thereās no practical benefit from receiving attention. Itās mainly psychological. Although in some cases, people will receive unnecessary surgeries. But thatās not to take anything away from its seriousness. Those who experience it often endure quite severe emotional difficulties and are at high risk of attempting to harm themselves so they can gain more treatment. There are two types of factitious disorder:
The first is:
- **Self-imposed factious disorder:**This involves falsifying psychological or physical symptoms. So for example, a person may mimic behaviour typical of letās say schizophrenia. Theyāll report all the associated signs and symptoms. But theyāll actually experience none of them.
- **Factitious Disorder Imposed on another:**People with this variant will produce or fabricate symptoms of those whoāre under their care. So, for example, elderly people, children, or the disabled. It most often occurs in motherās who may harm their child to gain attention.
Factitious disorder tends to affect less than 0.5% of the population.
## 5\. Capgras Syndrome
Also known as āimposter syndromeā or Capgras Delusion. People with this mental health condition believe that someone in their life that plays a significant role what been replaced with an imposter. And this inevitably leads them to accuse āsaid-person,ā whether it be a relative, friend, or co-worker of not being who they are mean to be. Again, as with erotomania, it can present as an individuated case. But itās also been known to present as a symptom of:
- Alzheimerās
- [Dementia](https://theprivatetherapyclinic.co.uk/issues/dementia/)
- Schizophrenia
- Epilepsy
However, thereās still no agreed-upon cause of how Capgras syndrome develops. Some researchers believe itās a neurological issue in the brain, caused by either atrophy, lesions, or cerebral dysfunction. While, on the other hand, others believe that itās a combination of physical and cognitive changes. With yet another theory stating itās a problem with perception linked to damaged or missing memories.
## 6\. Apotemnophilia
And this one might send a few shivers up your spine⦠If youāre unfamiliar with the condition, Apotemnophilia also known as body integrity disorder or amputee identity disorder is a neurological condition. Its defining characteristic is the overwhelming desire to either amputate or damage healthy parts of the body, which can also be known as āself-demand amputation.ā Compared to the other mental health disorders on this list, there isnāt a great deal thatās known about it. The first known case that was reported dates back to 1933 in medical journals citing, āerotically-obsessed persons who wanted to become amputees themselves.ā The firt actual scientific report only appeared in 1977. The cause is still unknown at this point, although itās speculated that it could be a result of psychiatric etiology, which refers to a āpathological desire driven by sexual compulsion.ā However, recent developments have also offered a neurological explanation, which says the condition could be the result of dysfunction within the right parietal lobe.
## 7\. Stendhal Syndrome
The next condition is perhaps something that might be used as a gag in a sitcom. But it is, however, a very real thing. Stendhal Syndrome is describe someone who experiences
- [Physical and or emotional anxiety](https://theprivatetherapyclinic.co.uk/issues/anxiety/),
- [Panic attacks](https://theprivatetherapyclinic.co.uk/issues/panic-attacks/),
- [Dissociate experiences](https://theprivatetherapyclinic.co.uk/services/dissociative-identity-disorder-treatment/)
- Hallucinations
When exposed to art⦠But not just any art⦠The symptoms are most often triggers by āart that is perceived as particularly beautiful or when the individual is exposed to large quantities of art that are concentrated in a single place.ā So for that, read:
- Museums
- Gallerys
- Exhibitions
Surprisingly, the syndrome has a fairly long history and was first coined in 1989 by an Italian psychiatrist, although reports of artwork causing distress date all the way back to the 1800s.
## 8\. Visual Snow Syndrome
Also, known as visual static or persistent positive visual phenomena. It describes a condition that will cause you to see continuous flickering white dots within your entire field of vision. These are the snow or static we just mentioned. These dots are usually blank and white, but also present as flashing, colour or even transparent.
The visual symptoms include:
- Floaters
- Flashes of light
- Compromised night vision
- Colour swirls
- A consistent imprinted image
- Sensitivity to light.
And then thereās alas a non-visual set of symptoms, which include:
- Migraines
- Tinnitus (Ringing in the ears)
- Vertigo
- Fatigue
- Tremors
- [Anxiety](https://theprivatetherapyclinic.co.uk/issues/anxiety/)
- [Depression](https://theprivatetherapyclinic.co.uk/issues/depression/)
No one is entirely certain how this condition develops, but the best research done so far, indicates itās perhaps a complex neurological condition. As for recorded cases, there isnāt a great deal of information with it being such a new diagnosis. And to date, there have only been around 200 cases worldwide
## 9\. Folie a Deux
Folie a Deux is almost like something from a supernatural thriller. Also known as shared delusion or shared psychotic disorder, it occurs when an otherwise mental stable person takes on the symptoms of someone close to them whoās suffering from a psychotics disorder such as schizophrenia. For example, letās say your partner has a psychotic disorder, which causes her to think that sheās being haunted by ghosts. If you have shared decisional disorder, you too will believe that youāre also being haunted by ghosts. However, the condition only tends to occur in long-term relationships in which the person with the psychotic disorder is dominant and the other partner is passive.
Shared psychotic disorders have also been known to happen in groups where thereās close involvement with a psychotic person. This variant is called folie a plusiers or the āthe madness of many.ā An example of this would be if a cult leader happened to be psychotic, his followers may then take on his/her delusions.
## 10\. Reduplicative Amnesia
Reduplicative Amnesia is very similar to Capgras syndrome. But in this case, instead of believing that people have been replaced with doubles, in those with Reduplicative Amnesia, they believe that their entire location has been duplicated. The way this manifests can vary, and itās often been attributed to severe head trauma that creates a dissociate-type effect between the individual and their environment. The condition was first documented back in 1903 by psychiatrist Arnold Pick, with a patient with suspected Alzheimerās. The woman in question insisted that sheād been moved from Pickās city clinic to one that was identical but located in a familiar suburb. Today, the condition is sometimes observed in people who may be suffering from:
- Alzheimerās
- Brain Tumours
- Dementia
- Brian Injury
- Psychiatric disorders
#### About the author
[  Dr Becky Spelman is an HCPC-registered Counselling Psychologist and founder of the Private Therapy Clinic, with over 22 years of experience helping clients successfully manage and overcome a wide range of mental health difficulties.](https://theprivatetherapyclinic.co.uk/therapists/dr-becky-spelman/)
#### References
Medscape (10th Jul 2014) 20 More Rare and Unusual Psychiatric Syndromes. Retrieved on 23rd September 2021 from, [Link](https://www.medscape.com/features/slideshow/culture-synd#2)
Med Circle (4th Aug 2020) Rare Mental Disorders: What You Need to Know. Retrieved on 23rd September 2021 from, [Link](https://medcircle.com/articles/rare-mental-disorders/)
Rarest.org (4th Feb 2021) 10 Rarest Mental Illnesses in the World. Retrieved on 23rd September 2021 from, [Link](https://rarest.org/people/mental-illnesses)
**Categories:** [Personality Disorders](https://theprivatetherapyclinic.co.uk/blog/category/personality-disorders/), [Psychiatry](https://theprivatetherapyclinic.co.uk/blog/category/psychiatry/), [Psychology](https://theprivatetherapyclinic.co.uk/blog/category/psychology/) - By Dr Becky Spelman - Published February 17, 2024 - Last updated July 27, 2025
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[Go to Top](https://theprivatetherapyclinic.co.uk/blog/10-of-the-rarest-mental-health-disorders/)
 |
| Readable Markdown | 
We all have a pretty good idea of what mental health disorders like depression and anxiety look like. Approximately 13% of the worldās population suffer from some kind of mental disorder. Thatās roughly 971 million people. But did you know thereās actually an entire spectrum of mental health disorders that are far removed from what you hear about in the mainstream they seem like the stuff fantasy?
Here are ten rare mental health disorders you never heard ofā¦
## 1\. Alice in Wonderland Syndrome
And in many ways, this *is* really drawing on the fantastical. Although it has no direct link to the actual source material, Alice in Wonderland Syndrome is very real and causes you to experience temporary episodes of distorted perception and disorientation. The name comes from the fact you may feel either larger or smaller than you really are⦠The room youāre in may also seem to shift and feel either closer or further away than it really is. But these arenāt hallucinations. These experiences are caused by changes in how your brain perceives your environment. And it doesnāt just affect your perception ā it can *and* does affect multiple senses and that includes your vision, touch, and hearing. Time can also become distorted as well ā either speeding up or slowing down. It tends only to affect young adults, as most people tend to grow out of it by the time they reach adulthood. Although cases still arenāt totally unheard ofā¦
## 2\. Erotomania
AKA de Clerambault Syndrome falls in the category of delusional disorders. In other words, itās a form of psychosis, which, in this case, leads people to believe that a figure who isnāt in their life ā and they may never even have met before ā is in love with them. In many cases, this can be a public figure or celebrity. And while it is *definitely* the work of fantasy and infatuation with no real grounding, the people having these āfeelingsā believe theyāre *absolutely* real. The actual cause of the condition isnāt exactly clear, and as with all mental health disorders the way it manifests will be very circumstantial and dependent on that personās environmental influences, current mental state and baseline personality. In the cases that *have* been recorded, it was discovered that erotomania isnāt a static condition. It *can* present by itself, but itās also be shown to present as a symptom of more serious mental health disorders such as:
- [Schizophrenia](https://theprivatetherapyclinic.co.uk/issues/paranoia/)
- [Major Depressive Disorder](https://theprivatetherapyclinic.co.uk/issues/depression/)
- [Bipolar](https://theprivatetherapyclinic.co.uk/issues/bipolar-disorder/)
- Alzheimerās
Some psychologists have even suggested that social media platforms such as Twitter, Instagram and YouTube can exacerbate the condition, as it breaks down the barrier between people who would otherwise be disconnected. It creates a false sense of kinship, and a sense of connection that the emotional vulnerable latch onto in their time of need. This has been backed up by several studies that suggest the attachment observed in erotomania is a form of coping mechanism for managing severe stress.
## 3\. Alien Hand Syndrome
Now, keeping on the theme of fantasy, weāre venturing into the realms of sci-fi with this one. Alien hand syndrome is a neurological condition that causes your hand to act of its own free will. Basically, the hand acts free of the mind and will move completely independently and out of sync with what the rest of the body is trying to do. It can make the hand feel as though itās not a part of the body and like itās a foreign object. Hence the name⦠And although it can affect children, cases are mostly confined to adults. It can also be referred to as Dr Strangelone syndrome, Strangelovian hand, or archaic hand. As for how itās caused⦠There are several factors at play. Some of the main causes include:
- Development as a side effect of a stroke, trauma, or tumour
- An effect of some types of cancer
- Neurodegenerative disease
- Brain aneurysms
And some of the symptoms include:
- The inability to control the hand
- The affected hand trying to perform goal-directed tasks or actions
- The hand moving without cognitive input or awareness
- Engaging in self-oppositional tasks (i.e closing a door you just opened)
- Being uncooperative with tasks that require both hands
## 4\. Factitious Disorder
People who suffer from this condition will deliberately attempt to fabricate signs of physical illness or injury to receive medical treatment and/or care and attention within a medical setting. And thatās the goal here, thereās no practical benefit from receiving attention. Itās mainly psychological. Although in some cases, people will receive unnecessary surgeries. But thatās not to take anything away from its seriousness. Those who experience it often endure quite severe emotional difficulties and are at high risk of attempting to harm themselves so they can gain more treatment. There are two types of factitious disorder:
The first is:
- **Self-imposed factious disorder:**This involves falsifying psychological or physical symptoms. So for example, a person may mimic behaviour typical of letās say schizophrenia. Theyāll report all the associated signs and symptoms. But theyāll actually experience none of them.
- **Factitious Disorder Imposed on another:**People with this variant will produce or fabricate symptoms of those whoāre under their care. So, for example, elderly people, children, or the disabled. It most often occurs in motherās who may harm their child to gain attention.
Factitious disorder tends to affect less than 0.5% of the population.
## 5\. Capgras Syndrome
Also known as āimposter syndromeā or Capgras Delusion. People with this mental health condition believe that someone in their life that plays a significant role what been replaced with an imposter. And this inevitably leads them to accuse āsaid-person,ā whether it be a relative, friend, or co-worker of not being who they are mean to be. Again, as with erotomania, it can present as an individuated case. But itās also been known to present as a symptom of:
- Alzheimerās
- [Dementia](https://theprivatetherapyclinic.co.uk/issues/dementia/)
- Schizophrenia
- Epilepsy
However, thereās still no agreed-upon cause of how Capgras syndrome develops. Some researchers believe itās a neurological issue in the brain, caused by either atrophy, lesions, or cerebral dysfunction. While, on the other hand, others believe that itās a combination of physical and cognitive changes. With yet another theory stating itās a problem with perception linked to damaged or missing memories.
## 6\. Apotemnophilia
And this one might send a few shivers up your spine⦠If youāre unfamiliar with the condition, Apotemnophilia also known as body integrity disorder or amputee identity disorder is a neurological condition. Its defining characteristic is the overwhelming desire to either amputate or damage healthy parts of the body, which can also be known as āself-demand amputation.ā Compared to the other mental health disorders on this list, there isnāt a great deal thatās known about it. The first known case that was reported dates back to 1933 in medical journals citing, āerotically-obsessed persons who wanted to become amputees themselves.ā The firt actual scientific report only appeared in 1977. The cause is still unknown at this point, although itās speculated that it could be a result of psychiatric etiology, which refers to a āpathological desire driven by sexual compulsion.ā However, recent developments have also offered a neurological explanation, which says the condition could be the result of dysfunction within the right parietal lobe.
## 7\. Stendhal Syndrome
The next condition is perhaps something that might be used as a gag in a sitcom. But it is, however, a very real thing. Stendhal Syndrome is describe someone who experiences
- [Physical and or emotional anxiety](https://theprivatetherapyclinic.co.uk/issues/anxiety/),
- [Panic attacks](https://theprivatetherapyclinic.co.uk/issues/panic-attacks/),
- [Dissociate experiences](https://theprivatetherapyclinic.co.uk/services/dissociative-identity-disorder-treatment/)
- Hallucinations
When exposed to art⦠But not just any art⦠The symptoms are most often triggers by āart that is perceived as particularly beautiful or when the individual is exposed to large quantities of art that are concentrated in a single place.ā So for that, read:
- Museums
- Gallerys
- Exhibitions
Surprisingly, the syndrome has a fairly long history and was first coined in 1989 by an Italian psychiatrist, although reports of artwork causing distress date all the way back to the 1800s.
## 8\. Visual Snow Syndrome
Also, known as visual static or persistent positive visual phenomena. It describes a condition that will cause you to see continuous flickering white dots within your entire field of vision. These are the snow or static we just mentioned. These dots are usually blank and white, but also present as flashing, colour or even transparent.
The visual symptoms include:
- Floaters
- Flashes of light
- Compromised night vision
- Colour swirls
- A consistent imprinted image
- Sensitivity to light.
And then thereās alas a non-visual set of symptoms, which include:
- Migraines
- Tinnitus (Ringing in the ears)
- Vertigo
- Fatigue
- Tremors
- [Anxiety](https://theprivatetherapyclinic.co.uk/issues/anxiety/)
- [Depression](https://theprivatetherapyclinic.co.uk/issues/depression/)
No one is entirely certain how this condition develops, but the best research done so far, indicates itās perhaps a complex neurological condition. As for recorded cases, there isnāt a great deal of information with it being such a new diagnosis. And to date, there have only been around 200 cases worldwide
## 9\. Folie a Deux
Folie a Deux is almost like something from a supernatural thriller. Also known as shared delusion or shared psychotic disorder, it occurs when an otherwise mental stable person takes on the symptoms of someone close to them whoās suffering from a psychotics disorder such as schizophrenia. For example, letās say your partner has a psychotic disorder, which causes her to think that sheās being haunted by ghosts. If you have shared decisional disorder, you too will believe that youāre also being haunted by ghosts. However, the condition only tends to occur in long-term relationships in which the person with the psychotic disorder is dominant and the other partner is passive.
Shared psychotic disorders have also been known to happen in groups where thereās close involvement with a psychotic person. This variant is called folie a plusiers or the āthe madness of many.ā An example of this would be if a cult leader happened to be psychotic, his followers may then take on his/her delusions.
## 10\. Reduplicative Amnesia
Reduplicative Amnesia is very similar to Capgras syndrome. But in this case, instead of believing that people have been replaced with doubles, in those with Reduplicative Amnesia, they believe that their entire location has been duplicated. The way this manifests can vary, and itās often been attributed to severe head trauma that creates a dissociate-type effect between the individual and their environment. The condition was first documented back in 1903 by psychiatrist Arnold Pick, with a patient with suspected Alzheimerās. The woman in question insisted that sheād been moved from Pickās city clinic to one that was identical but located in a familiar suburb. Today, the condition is sometimes observed in people who may be suffering from:
- Alzheimerās
- Brain Tumours
- Dementia
- Brian Injury
- Psychiatric disorders |
| Shard | 72 (laksa) |
| Root Hash | 2325565954095926272 |
| Unparsed URL | uk,co,theprivatetherapyclinic!/blog/10-of-the-rarest-mental-health-disorders/ s443 |