🕷️ Crawler Inspector

URL Lookup

Direct Parameter Lookup

Raw Queries and Responses

1. Shard Calculation

Query:

Response:

Calculated Shard: 75 (from laksa092)

2. Crawled Status Check

Query:

curl -X POST \
  'http://laksa075.int.ahrefs:8124/' \
  -H 'Content-Type: text/plain' \
  -H 'X-ClickHouse-Database: crawler3' \
  -H 'Authorization: Basic YXBpOg==' \
  -d 'SELECT getAhrefsURLFromUnparsed(src_unparsed) AS found_url, ifNull(toUnixTimestamp(download_stamp), 0) AS crawl_time, ifNull(toUnixTimestamp(props_url_first_seen), 0) AS first_indexed_time, download_http_code AS http_code, src_unparsed AS src_unparsed, src_root_hash AS src_root_hash, history_drop_reason AS history_drop_reason, meta_title AS meta_title, meta_descriptions AS meta_descriptions, attrs_boilerpipe_text AS attrs_boilerpipe_text, attrs_markdown AS attrs_markdown, attrs_readable_markdown AS attrs_readable_markdown, meta_canonical AS meta_canonical FROM crawler3.page_info_local FINAL PREWHERE (src_root_hash, src_unparsed) IN ((getAhrefsRootHashFromUnparsed(getAhrefsUnparsedNoserviceFromURL(\'https://www.nhs.uk/conditions/heart-attack/symptoms/\')), getAhrefsUnparsedNoserviceFromURL(\'https://www.nhs.uk/conditions/heart-attack/symptoms/\'))) FORMAT JSONEachRow'

Response:

{"found_url":"https:\/\/www.nhs.uk\/conditions\/heart-attack\/symptoms\/","crawl_time":1775602413,"first_indexed_time":1510256026,"http_code":200,"src_unparsed":"uk,nhs,www!\/conditions\/heart-attack\/symptoms\/ s443","src_root_hash":"11359509702434384875","history_drop_reason":null,"meta_title":"Symptoms of a heart attack - NHS","meta_descriptions":["Read about symptoms of a heart attack, including chest pain, shortness of breath, feeling and being sick, and anxiety."],"attrs_boilerpipe_text":"Call 999 immediately if you think someone might be having a heart attack. The faster you act, the better their chances.\nSymptoms of a heart attack\nSymptoms of a heart attack can include:\nchest pain – a feeling of pressure, heaviness, tightness or squeezing across your chest\npain in other parts of the body – it can feel as if the pain is spreading from your chest to your arms (usually the left arm, but it can affect both arms), jaw, neck, back and tummy\nfeeling lightheaded or dizzy\nsweating\nshortness of breath\nfeeling sick (nausea) or being sick (vomiting)\nan overwhelming feeling of anxiety (similar to a panic attack)\ncoughing or wheezing\nThe chest pain is often severe, but some people may only experience minor pain, similar to indigestion.\nWhile the most common symptom is chest pain, symptoms can vary from person to person. Some people may have other symptoms such as shortness of breath, feeling or being sick and back or jaw pain without any chest pain.\nWaiting for an ambulance\nIf you have had a heart attack, it's important that you rest while you wait for an ambulance, to avoid unnecessary strain on your heart.\nIf aspirin is available and you are not allergic to it, slowly chew and then swallow an adult-size tablet (300mg) while you wait for the ambulance.\nAspirin helps to thin your blood and improve blood flow to your heart.\nCardiac arrest \nIn some cases, a complication called ventricular arrhythmia can cause the heart to stop beating. This is known as sudden cardiac arrest.\nSigns and symptoms that suggest a person has gone into cardiac arrest include:\nthey appear not to be breathing\nthey're not moving\nthey don't respond to any stimulation, such as being touched or spoken to\nIf you think somebody has gone into cardiac arrest, call 999 immediately and start doing\ncardiopulmonary resuscitation (CPR)\n.\nIf there is someone with you, ask them to find an automated external defibrillator (AED) and use it as soon as you can.\nHands-only CPR (chest compressions)\nTo do chest compressions on an adult:\nPlace the heel of your hand on the breastbone at the centre of the person's chest. Place your other hand on top of your first hand and interlock your fingers.\nUsing your body weight (not just your arms), press straight down by 5 to 6cm on their chest.\nRepeat this until an ambulance arrives.\nAim to do 100 to 120 compressions a minute.\nFind out about\nhow to resuscitate a child\n.\nAutomated external defibrillator (AED)\nIf you have access to an AED, you should use it. An AED is a safe, portable electrical device that most large organisations keep as part of first aid equipment.\nIt helps to establish a regular heartbeat during a cardiac arrest by monitoring the person's heartbeat and giving them an electric shock if necessary.\nFind out more about automated external defibrillators (AED) on the Arrhythmia Alliance website\nAngina and heart attacks\nAngina\nis chest pain caused by the supply of oxygen-rich blood to the heart becoming restricted.\nPeople with angina can experience similar symptoms to a heart attack, but they usually happen during exercise and pass within a few minutes.\nHowever, occasionally, people with angina can have a heart attack.\nIt's important to recognise the difference between the symptoms of angina and those of a heart attack.\nSymptoms of angina can be controlled with a medicine called glyceryl trinitrate that's prescribed for people who have angina. The medicine should improve the symptoms within 5 minutes.\nIf you're having a heart attack, the medicine will not work.\nIf the first dose of glyceryl trinitrate you take does not work after 5 minutes, take a second dose.\nIf the second dose does not work after 5 minutes, call 999.\nCall 999 sooner if the pain gets worse or you also feel unwell, sick, dizzy or short of breath.\nPage last reviewed: 13 July 2023\nNext review due: 13 July 2026","attrs_markdown":"\n\n[Skip to main content](https:\/\/www.nhs.uk\/conditions\/heart-attack\/symptoms\/#maincontent)\n\n- [Health A to Z](https:\/\/www.nhs.uk\/health-a-to-z\/)\n- [NHS services](https:\/\/www.nhs.uk\/nhs-services\/)\n- [Healthy living](https:\/\/www.nhs.uk\/live-well\/)\n- [Mental health](https:\/\/www.nhs.uk\/mental-health\/)\n- [Care and support](https:\/\/www.nhs.uk\/social-care-and-support\/)\n- [Home](https:\/\/www.nhs.uk\/)\n- Browse More\n\n1. [Home](https:\/\/www.nhs.uk\/)\n2. [Health A to Z](https:\/\/www.nhs.uk\/health-a-to-z\/)\n3. [Conditions A to Z](https:\/\/www.nhs.uk\/conditions\/)\n4. [Heart attack](https:\/\/www.nhs.uk\/conditions\/heart-attack\/)\n\n[Back to Heart attack](https:\/\/www.nhs.uk\/conditions\/heart-attack\/)\n\n# Symptoms   -  Heart attack\n## Contents\n1. [Overview](https:\/\/www.nhs.uk\/conditions\/heart-attack\/)\n2. Symptoms\n3. [Causes](https:\/\/www.nhs.uk\/conditions\/heart-attack\/causes\/)\n4. [Diagnosis](https:\/\/www.nhs.uk\/conditions\/heart-attack\/diagnosis\/)\n5. [Treatment](https:\/\/www.nhs.uk\/conditions\/heart-attack\/treatment\/)\n6. [Recovery](https:\/\/www.nhs.uk\/conditions\/heart-attack\/recovery\/)\n7. [Complications](https:\/\/www.nhs.uk\/conditions\/heart-attack\/complications\/)\n8. [Prevention](https:\/\/www.nhs.uk\/conditions\/heart-attack\/prevention\/)\n\n**Call 999 immediately if you think someone might be having a heart attack. The faster you act, the better their chances.**\n\n## Symptoms of a heart attack\nSymptoms of a heart attack can include:\n\n- chest pain – a feeling of pressure, heaviness, tightness or squeezing across your chest\n- pain in other parts of the body – it can feel as if the pain is spreading from your chest to your arms (usually the left arm, but it can affect both arms), jaw, neck, back and tummy\n- feeling lightheaded or dizzy\n- sweating\n- shortness of breath\n- feeling sick (nausea) or being sick (vomiting)\n- an overwhelming feeling of anxiety (similar to a panic attack)\n- coughing or wheezing\n\nThe chest pain is often severe, but some people may only experience minor pain, similar to indigestion.\n\nWhile the most common symptom is chest pain, symptoms can vary from person to person. Some people may have other symptoms such as shortness of breath, feeling or being sick and back or jaw pain without any chest pain.\n\n## Waiting for an ambulance\nIf you have had a heart attack, it's important that you rest while you wait for an ambulance, to avoid unnecessary strain on your heart.\n\nIf aspirin is available and you are not allergic to it, slowly chew and then swallow an adult-size tablet (300mg) while you wait for the ambulance.\n\nAspirin helps to thin your blood and improve blood flow to your heart.\n\n## Cardiac arrest\nIn some cases, a complication called ventricular arrhythmia can cause the heart to stop beating. This is known as sudden cardiac arrest.\n\nSigns and symptoms that suggest a person has gone into cardiac arrest include:\n\n- they appear not to be breathing\n- they're not moving\n- they don't respond to any stimulation, such as being touched or spoken to\n\nIf you think somebody has gone into cardiac arrest, call 999 immediately and start doing [cardiopulmonary resuscitation (CPR)](https:\/\/www.nhs.uk\/tests-and-treatments\/first-aid\/cpr\/).\n\nIf there is someone with you, ask them to find an automated external defibrillator (AED) and use it as soon as you can.\n\n### Hands-only CPR (chest compressions)\nTo do chest compressions on an adult:\n\n1. Place the heel of your hand on the breastbone at the centre of the person's chest. Place your other hand on top of your first hand and interlock your fingers.\n2. Using your body weight (not just your arms), press straight down by 5 to 6cm on their chest.\n3. Repeat this until an ambulance arrives.\n\nAim to do 100 to 120 compressions a minute.\n\nFind out about [how to resuscitate a child](https:\/\/www.nhs.uk\/conditions\/pregnancy-and-baby\/resuscitating-a-baby\/).\n\n### Automated external defibrillator (AED)\nIf you have access to an AED, you should use it. An AED is a safe, portable electrical device that most large organisations keep as part of first aid equipment.\n\nIt helps to establish a regular heartbeat during a cardiac arrest by monitoring the person's heartbeat and giving them an electric shock if necessary.\n\n[Find out more about automated external defibrillators (AED) on the Arrhythmia Alliance website](https:\/\/heartrhythmalliance.org\/aa\/uk\/programs\/defibs-save-lives\/what-you-need-to-know\/automatic-external-defibrillators)\n\n## Angina and heart attacks\n[Angina](https:\/\/www.nhs.uk\/conditions\/angina\/) is chest pain caused by the supply of oxygen-rich blood to the heart becoming restricted.\n\nPeople with angina can experience similar symptoms to a heart attack, but they usually happen during exercise and pass within a few minutes.\n\nHowever, occasionally, people with angina can have a heart attack.\n\nIt's important to recognise the difference between the symptoms of angina and those of a heart attack.\n\nSymptoms of angina can be controlled with a medicine called glyceryl trinitrate that's prescribed for people who have angina. The medicine should improve the symptoms within 5 minutes.\n\nIf you're having a heart attack, the medicine will not work.\n\nIf the first dose of glyceryl trinitrate you take does not work after 5 minutes, take a second dose.\n\nIf the second dose does not work after 5 minutes, call 999.\n\nCall 999 sooner if the pain gets worse or you also feel unwell, sick, dizzy or short of breath.\n\nPage last reviewed: 13 July 2023  \n Next review due: 13 July 2026\n\n- [Previous : Heart attack](https:\/\/www.nhs.uk\/conditions\/heart-attack\/)\n- [Next : Causes](https:\/\/www.nhs.uk\/conditions\/heart-attack\/causes\/)\n\n## Support links\n- [Home](https:\/\/www.nhs.uk\/)\n- [Health A to Z](https:\/\/www.nhs.uk\/health-a-to-z\/)\n- [NHS services](https:\/\/www.nhs.uk\/nhs-services\/)\n- [Healthy living](https:\/\/www.nhs.uk\/live-well\/)\n- [Mental health](https:\/\/www.nhs.uk\/mental-health\/)\n- [Care and support](https:\/\/www.nhs.uk\/social-care-and-support\/)\n- [COVID-19](https:\/\/www.nhs.uk\/conditions\/covid-19\/)\n\n- [NHS App](https:\/\/www.nhs.uk\/nhs-app\/)\n- [Find my NHS number](https:\/\/www.nhs.uk\/nhs-services\/online-services\/find-nhs-number\/)\n- [View your GP health record](https:\/\/www.nhs.uk\/nhs-services\/gps\/view-your-gp-health-record\/)\n- [View your test results](https:\/\/www.nhs.uk\/nhs-services\/online-services\/view-your-test-results\/)\n- [About the NHS](https:\/\/www.nhs.uk\/using-the-nhs\/about-the-nhs\/)\n- [Healthcare abroad](https:\/\/www.nhs.uk\/using-the-nhs\/healthcare-abroad\/)\n\n- [Other NHS websites](https:\/\/www.nhs.uk\/nhs-sites\/)\n- [Profile editor login](https:\/\/www.nhs.uk\/our-policies\/profile-editor-login\/)\n\n- [About us](https:\/\/www.nhs.uk\/about-us\/)\n- [Report an issue with the NHS website](https:\/\/www.nhs.uk\/report-an-issue-with-the-nhs-website)\n- [Accessibility statement](https:\/\/www.nhs.uk\/accessibility-statement\/)\n- [Our policies](https:\/\/www.nhs.uk\/our-policies\/)\n- [Cookies](https:\/\/www.nhs.uk\/our-policies\/choose-your-cookie-settings\/)\n\n© Crown copyright","attrs_readable_markdown":"**Call 999 immediately if you think someone might be having a heart attack. The faster you act, the better their chances.**\n\n## Symptoms of a heart attack\nSymptoms of a heart attack can include:\n\n- chest pain – a feeling of pressure, heaviness, tightness or squeezing across your chest\n- pain in other parts of the body – it can feel as if the pain is spreading from your chest to your arms (usually the left arm, but it can affect both arms), jaw, neck, back and tummy\n- feeling lightheaded or dizzy\n- sweating\n- shortness of breath\n- feeling sick (nausea) or being sick (vomiting)\n- an overwhelming feeling of anxiety (similar to a panic attack)\n- coughing or wheezing\n\nThe chest pain is often severe, but some people may only experience minor pain, similar to indigestion.\n\nWhile the most common symptom is chest pain, symptoms can vary from person to person. Some people may have other symptoms such as shortness of breath, feeling or being sick and back or jaw pain without any chest pain.\n\n## Waiting for an ambulance\nIf you have had a heart attack, it's important that you rest while you wait for an ambulance, to avoid unnecessary strain on your heart.\n\nIf aspirin is available and you are not allergic to it, slowly chew and then swallow an adult-size tablet (300mg) while you wait for the ambulance.\n\nAspirin helps to thin your blood and improve blood flow to your heart.\n\n## Cardiac arrest\nIn some cases, a complication called ventricular arrhythmia can cause the heart to stop beating. This is known as sudden cardiac arrest.\n\nSigns and symptoms that suggest a person has gone into cardiac arrest include:\n\n- they appear not to be breathing\n- they're not moving\n- they don't respond to any stimulation, such as being touched or spoken to\n\nIf you think somebody has gone into cardiac arrest, call 999 immediately and start doing [cardiopulmonary resuscitation (CPR)](https:\/\/www.nhs.uk\/tests-and-treatments\/first-aid\/cpr\/).\n\nIf there is someone with you, ask them to find an automated external defibrillator (AED) and use it as soon as you can.\n\n### Hands-only CPR (chest compressions)\nTo do chest compressions on an adult:\n\n1. Place the heel of your hand on the breastbone at the centre of the person's chest. Place your other hand on top of your first hand and interlock your fingers.\n2. Using your body weight (not just your arms), press straight down by 5 to 6cm on their chest.\n3. Repeat this until an ambulance arrives.\n\nAim to do 100 to 120 compressions a minute.\n\nFind out about [how to resuscitate a child](https:\/\/www.nhs.uk\/conditions\/pregnancy-and-baby\/resuscitating-a-baby\/).\n\n### Automated external defibrillator (AED)\nIf you have access to an AED, you should use it. An AED is a safe, portable electrical device that most large organisations keep as part of first aid equipment.\n\nIt helps to establish a regular heartbeat during a cardiac arrest by monitoring the person's heartbeat and giving them an electric shock if necessary.\n\n[Find out more about automated external defibrillators (AED) on the Arrhythmia Alliance website](https:\/\/heartrhythmalliance.org\/aa\/uk\/programs\/defibs-save-lives\/what-you-need-to-know\/automatic-external-defibrillators)\n\n## Angina and heart attacks\n[Angina](https:\/\/www.nhs.uk\/conditions\/angina\/) is chest pain caused by the supply of oxygen-rich blood to the heart becoming restricted.\n\nPeople with angina can experience similar symptoms to a heart attack, but they usually happen during exercise and pass within a few minutes.\n\nHowever, occasionally, people with angina can have a heart attack.\n\nIt's important to recognise the difference between the symptoms of angina and those of a heart attack.\n\nSymptoms of angina can be controlled with a medicine called glyceryl trinitrate that's prescribed for people who have angina. The medicine should improve the symptoms within 5 minutes.\n\nIf you're having a heart attack, the medicine will not work.\n\nIf the first dose of glyceryl trinitrate you take does not work after 5 minutes, take a second dose.\n\nIf the second dose does not work after 5 minutes, call 999.\n\nCall 999 sooner if the pain gets worse or you also feel unwell, sick, dizzy or short of breath.\n\nPage last reviewed: 13 July 2023  \n Next review due: 13 July 2026","meta_canonical":null}

3. Robots.txt Check

Query:

Response:

4. Spam/Ban Check

Query:

Response:

5. Seen Status Check

ℹ️ Skipped - page is already crawled

📄

INDEXABLE

✅

CRAWLED

1 day ago

🤖

ROBOTS ALLOWED

Page Info Filters

Filter	Status	Condition	Details
HTTP status	PASS	`download_http_code = 200`	HTTP 200
Age cutoff	PASS	`download_stamp > now() - 6 MONTH`	0.1 months ago
History drop	PASS	`isNull(history_drop_reason)`	No drop reason
Spam/ban	PASS	`fh_dont_index != 1 AND ml_spam_score = 0`	ml_spam_score=0
Canonical	PASS	`meta_canonical IS NULL OR = '' OR = src_unparsed`	Not set

Page Details

Property	Value
URL	https://www.nhs.uk/conditions/heart-attack/symptoms/
Last Crawled	2026-04-07 22:53:33 (1 day ago)
First Indexed	2017-11-09 19:33:46 (8 years ago)
HTTP Status Code	200
Meta Title	Symptoms of a heart attack - NHS
Meta Description	Read about symptoms of a heart attack, including chest pain, shortness of breath, feeling and being sick, and anxiety.
Meta Canonical	null
Boilerpipe Text	Call 999 immediately if you think someone might be having a heart attack. The faster you act, the better their chances. Symptoms of a heart attack Symptoms of a heart attack can include: chest pain – a feeling of pressure, heaviness, tightness or squeezing across your chest pain in other parts of the body – it can feel as if the pain is spreading from your chest to your arms (usually the left arm, but it can affect both arms), jaw, neck, back and tummy feeling lightheaded or dizzy sweating shortness of breath feeling sick (nausea) or being sick (vomiting) an overwhelming feeling of anxiety (similar to a panic attack) coughing or wheezing The chest pain is often severe, but some people may only experience minor pain, similar to indigestion. While the most common symptom is chest pain, symptoms can vary from person to person. Some people may have other symptoms such as shortness of breath, feeling or being sick and back or jaw pain without any chest pain. Waiting for an ambulance If you have had a heart attack, it's important that you rest while you wait for an ambulance, to avoid unnecessary strain on your heart. If aspirin is available and you are not allergic to it, slowly chew and then swallow an adult-size tablet (300mg) while you wait for the ambulance. Aspirin helps to thin your blood and improve blood flow to your heart. Cardiac arrest In some cases, a complication called ventricular arrhythmia can cause the heart to stop beating. This is known as sudden cardiac arrest. Signs and symptoms that suggest a person has gone into cardiac arrest include: they appear not to be breathing they're not moving they don't respond to any stimulation, such as being touched or spoken to If you think somebody has gone into cardiac arrest, call 999 immediately and start doing cardiopulmonary resuscitation (CPR) . If there is someone with you, ask them to find an automated external defibrillator (AED) and use it as soon as you can. Hands-only CPR (chest compressions) To do chest compressions on an adult: Place the heel of your hand on the breastbone at the centre of the person's chest. Place your other hand on top of your first hand and interlock your fingers. Using your body weight (not just your arms), press straight down by 5 to 6cm on their chest. Repeat this until an ambulance arrives. Aim to do 100 to 120 compressions a minute. Find out about how to resuscitate a child . Automated external defibrillator (AED) If you have access to an AED, you should use it. An AED is a safe, portable electrical device that most large organisations keep as part of first aid equipment. It helps to establish a regular heartbeat during a cardiac arrest by monitoring the person's heartbeat and giving them an electric shock if necessary. Find out more about automated external defibrillators (AED) on the Arrhythmia Alliance website Angina and heart attacks Angina is chest pain caused by the supply of oxygen-rich blood to the heart becoming restricted. People with angina can experience similar symptoms to a heart attack, but they usually happen during exercise and pass within a few minutes. However, occasionally, people with angina can have a heart attack. It's important to recognise the difference between the symptoms of angina and those of a heart attack. Symptoms of angina can be controlled with a medicine called glyceryl trinitrate that's prescribed for people who have angina. The medicine should improve the symptoms within 5 minutes. If you're having a heart attack, the medicine will not work. If the first dose of glyceryl trinitrate you take does not work after 5 minutes, take a second dose. If the second dose does not work after 5 minutes, call 999. Call 999 sooner if the pain gets worse or you also feel unwell, sick, dizzy or short of breath. Page last reviewed: 13 July 2023 Next review due: 13 July 2026
Markdown	[Skip to main content](https://www.nhs.uk/conditions/heart-attack/symptoms/#maincontent) - [Health A to Z](https://www.nhs.uk/health-a-to-z/) - [NHS services](https://www.nhs.uk/nhs-services/) - [Healthy living](https://www.nhs.uk/live-well/) - [Mental health](https://www.nhs.uk/mental-health/) - [Care and support](https://www.nhs.uk/social-care-and-support/) - [Home](https://www.nhs.uk/) - Browse More 1. [Home](https://www.nhs.uk/) 2. [Health A to Z](https://www.nhs.uk/health-a-to-z/) 3. [Conditions A to Z](https://www.nhs.uk/conditions/) 4. [Heart attack](https://www.nhs.uk/conditions/heart-attack/) [Back to Heart attack](https://www.nhs.uk/conditions/heart-attack/) # Symptoms - Heart attack ## Contents 1. [Overview](https://www.nhs.uk/conditions/heart-attack/) 2. Symptoms 3. [Causes](https://www.nhs.uk/conditions/heart-attack/causes/) 4. [Diagnosis](https://www.nhs.uk/conditions/heart-attack/diagnosis/) 5. [Treatment](https://www.nhs.uk/conditions/heart-attack/treatment/) 6. [Recovery](https://www.nhs.uk/conditions/heart-attack/recovery/) 7. [Complications](https://www.nhs.uk/conditions/heart-attack/complications/) 8. [Prevention](https://www.nhs.uk/conditions/heart-attack/prevention/) Call 999 immediately if you think someone might be having a heart attack. The faster you act, the better their chances. ## Symptoms of a heart attack Symptoms of a heart attack can include: - chest pain – a feeling of pressure, heaviness, tightness or squeezing across your chest - pain in other parts of the body – it can feel as if the pain is spreading from your chest to your arms (usually the left arm, but it can affect both arms), jaw, neck, back and tummy - feeling lightheaded or dizzy - sweating - shortness of breath - feeling sick (nausea) or being sick (vomiting) - an overwhelming feeling of anxiety (similar to a panic attack) - coughing or wheezing The chest pain is often severe, but some people may only experience minor pain, similar to indigestion. While the most common symptom is chest pain, symptoms can vary from person to person. Some people may have other symptoms such as shortness of breath, feeling or being sick and back or jaw pain without any chest pain. ## Waiting for an ambulance If you have had a heart attack, it's important that you rest while you wait for an ambulance, to avoid unnecessary strain on your heart. If aspirin is available and you are not allergic to it, slowly chew and then swallow an adult-size tablet (300mg) while you wait for the ambulance. Aspirin helps to thin your blood and improve blood flow to your heart. ## Cardiac arrest In some cases, a complication called ventricular arrhythmia can cause the heart to stop beating. This is known as sudden cardiac arrest. Signs and symptoms that suggest a person has gone into cardiac arrest include: - they appear not to be breathing - they're not moving - they don't respond to any stimulation, such as being touched or spoken to If you think somebody has gone into cardiac arrest, call 999 immediately and start doing [cardiopulmonary resuscitation (CPR)](https://www.nhs.uk/tests-and-treatments/first-aid/cpr/). If there is someone with you, ask them to find an automated external defibrillator (AED) and use it as soon as you can. ### Hands-only CPR (chest compressions) To do chest compressions on an adult: 1. Place the heel of your hand on the breastbone at the centre of the person's chest. Place your other hand on top of your first hand and interlock your fingers. 2. Using your body weight (not just your arms), press straight down by 5 to 6cm on their chest. 3. Repeat this until an ambulance arrives. Aim to do 100 to 120 compressions a minute. Find out about [how to resuscitate a child](https://www.nhs.uk/conditions/pregnancy-and-baby/resuscitating-a-baby/). ### Automated external defibrillator (AED) If you have access to an AED, you should use it. An AED is a safe, portable electrical device that most large organisations keep as part of first aid equipment. It helps to establish a regular heartbeat during a cardiac arrest by monitoring the person's heartbeat and giving them an electric shock if necessary. [Find out more about automated external defibrillators (AED) on the Arrhythmia Alliance website](https://heartrhythmalliance.org/aa/uk/programs/defibs-save-lives/what-you-need-to-know/automatic-external-defibrillators) ## Angina and heart attacks [Angina](https://www.nhs.uk/conditions/angina/) is chest pain caused by the supply of oxygen-rich blood to the heart becoming restricted. People with angina can experience similar symptoms to a heart attack, but they usually happen during exercise and pass within a few minutes. However, occasionally, people with angina can have a heart attack. It's important to recognise the difference between the symptoms of angina and those of a heart attack. Symptoms of angina can be controlled with a medicine called glyceryl trinitrate that's prescribed for people who have angina. The medicine should improve the symptoms within 5 minutes. If you're having a heart attack, the medicine will not work. If the first dose of glyceryl trinitrate you take does not work after 5 minutes, take a second dose. If the second dose does not work after 5 minutes, call 999. Call 999 sooner if the pain gets worse or you also feel unwell, sick, dizzy or short of breath. Page last reviewed: 13 July 2023 Next review due: 13 July 2026 - [Previous : Heart attack](https://www.nhs.uk/conditions/heart-attack/) - [Next : Causes](https://www.nhs.uk/conditions/heart-attack/causes/) ## Support links - [Home](https://www.nhs.uk/) - [Health A to Z](https://www.nhs.uk/health-a-to-z/) - [NHS services](https://www.nhs.uk/nhs-services/) - [Healthy living](https://www.nhs.uk/live-well/) - [Mental health](https://www.nhs.uk/mental-health/) - [Care and support](https://www.nhs.uk/social-care-and-support/) - [COVID-19](https://www.nhs.uk/conditions/covid-19/) - [NHS App](https://www.nhs.uk/nhs-app/) - [Find my NHS number](https://www.nhs.uk/nhs-services/online-services/find-nhs-number/) - [View your GP health record](https://www.nhs.uk/nhs-services/gps/view-your-gp-health-record/) - [View your test results](https://www.nhs.uk/nhs-services/online-services/view-your-test-results/) - [About the NHS](https://www.nhs.uk/using-the-nhs/about-the-nhs/) - [Healthcare abroad](https://www.nhs.uk/using-the-nhs/healthcare-abroad/) - [Other NHS websites](https://www.nhs.uk/nhs-sites/) - [Profile editor login](https://www.nhs.uk/our-policies/profile-editor-login/) - [About us](https://www.nhs.uk/about-us/) - [Report an issue with the NHS website](https://www.nhs.uk/report-an-issue-with-the-nhs-website) - [Accessibility statement](https://www.nhs.uk/accessibility-statement/) - [Our policies](https://www.nhs.uk/our-policies/) - [Cookies](https://www.nhs.uk/our-policies/choose-your-cookie-settings/) © Crown copyright
Readable Markdown	Call 999 immediately if you think someone might be having a heart attack. The faster you act, the better their chances. ## Symptoms of a heart attack Symptoms of a heart attack can include: - chest pain – a feeling of pressure, heaviness, tightness or squeezing across your chest - pain in other parts of the body – it can feel as if the pain is spreading from your chest to your arms (usually the left arm, but it can affect both arms), jaw, neck, back and tummy - feeling lightheaded or dizzy - sweating - shortness of breath - feeling sick (nausea) or being sick (vomiting) - an overwhelming feeling of anxiety (similar to a panic attack) - coughing or wheezing The chest pain is often severe, but some people may only experience minor pain, similar to indigestion. While the most common symptom is chest pain, symptoms can vary from person to person. Some people may have other symptoms such as shortness of breath, feeling or being sick and back or jaw pain without any chest pain. ## Waiting for an ambulance If you have had a heart attack, it's important that you rest while you wait for an ambulance, to avoid unnecessary strain on your heart. If aspirin is available and you are not allergic to it, slowly chew and then swallow an adult-size tablet (300mg) while you wait for the ambulance. Aspirin helps to thin your blood and improve blood flow to your heart. ## Cardiac arrest In some cases, a complication called ventricular arrhythmia can cause the heart to stop beating. This is known as sudden cardiac arrest. Signs and symptoms that suggest a person has gone into cardiac arrest include: - they appear not to be breathing - they're not moving - they don't respond to any stimulation, such as being touched or spoken to If you think somebody has gone into cardiac arrest, call 999 immediately and start doing [cardiopulmonary resuscitation (CPR)](https://www.nhs.uk/tests-and-treatments/first-aid/cpr/). If there is someone with you, ask them to find an automated external defibrillator (AED) and use it as soon as you can. ### Hands-only CPR (chest compressions) To do chest compressions on an adult: 1. Place the heel of your hand on the breastbone at the centre of the person's chest. Place your other hand on top of your first hand and interlock your fingers. 2. Using your body weight (not just your arms), press straight down by 5 to 6cm on their chest. 3. Repeat this until an ambulance arrives. Aim to do 100 to 120 compressions a minute. Find out about [how to resuscitate a child](https://www.nhs.uk/conditions/pregnancy-and-baby/resuscitating-a-baby/). ### Automated external defibrillator (AED) If you have access to an AED, you should use it. An AED is a safe, portable electrical device that most large organisations keep as part of first aid equipment. It helps to establish a regular heartbeat during a cardiac arrest by monitoring the person's heartbeat and giving them an electric shock if necessary. [Find out more about automated external defibrillators (AED) on the Arrhythmia Alliance website](https://heartrhythmalliance.org/aa/uk/programs/defibs-save-lives/what-you-need-to-know/automatic-external-defibrillators) ## Angina and heart attacks [Angina](https://www.nhs.uk/conditions/angina/) is chest pain caused by the supply of oxygen-rich blood to the heart becoming restricted. People with angina can experience similar symptoms to a heart attack, but they usually happen during exercise and pass within a few minutes. However, occasionally, people with angina can have a heart attack. It's important to recognise the difference between the symptoms of angina and those of a heart attack. Symptoms of angina can be controlled with a medicine called glyceryl trinitrate that's prescribed for people who have angina. The medicine should improve the symptoms within 5 minutes. If you're having a heart attack, the medicine will not work. If the first dose of glyceryl trinitrate you take does not work after 5 minutes, take a second dose. If the second dose does not work after 5 minutes, call 999. Call 999 sooner if the pain gets worse or you also feel unwell, sick, dizzy or short of breath. Page last reviewed: 13 July 2023 Next review due: 13 July 2026
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