Fainting | Symptom Checker
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What causes fainting? 41 possible conditions

See a list of possible causes in order from the most common to the least.

21

Multifocal Atrial Tachycardia and Your Heart

MAT causes your heart to beat much faster than it normally should. Learn about other symptoms and treatment options.

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22

Hyperemesis Gravidarum

Hyperemesis gravidarum (HG) is an extreme form of morning sickness that causes severe nausea and vomiting during pregnancy.

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23

Alcohol Withdrawal Syndrome

This condition is considered a medical emergency. Urgent care may be required.

Alcohol withdrawal syndrome (AWS) is the name for the symptoms that occur when a heavy drinker suddenly stops or significantly reduces their alcohol intake. With AWS, you may feel mild anxiety and fatigue. You may als...

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24

Lyme Disease

Lyme disease is an infectious condition transmitted via tick bite. A "bull's eye" rash at the site of the bite is an early symptom of this disease.

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25

Carbon Monoxide Poisoning

This condition is considered a medical emergency. Urgent care may be required.

Learn about carbon monoxide poisoning and what causes it. Find information on carbon monoxide symptoms, diagnosis, treatment, and prevention.

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26

Fertilizer and Plant Food Poisoning

This condition is considered a medical emergency. Urgent care may be required.

It's common to find plant fertilizer in homes and gardens, but plant foods can be dangerous to both people and pets. Learn more about plant food poisoning.

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27

Guillain-Barre Syndrome

This condition is considered a medical emergency. Urgent care may be required.

Guillain-Barre syndrome is a rare but serious autoimmune disorder. An infectious disease, like the stomach flu or a lung infection, usually triggers it.

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28

Post Traumatic Stress Disorder (PTSD)

PTSD can affect anyone who has undergone a traumatic event. Read more on how to cope with it.

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29

Hypertrophic Cardiomyopathy

Hypertrophic cardiomyopathy is a condition in which your heart muscle is thicker than normal. It can interfere with your heart's ability to pump blood.

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30

Aortic Valve Stenosis

The aorta is the main artery of the body. Oxygenated blood leaves the heart by way of the aorta and is carried to all parts of the body. The left ventricle is the chamber of the heart that pumps blood into the aort...

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31

Tetralogy of Fallot (TOF)

Tetralogy of Fallot is a serious, congenital heart defect characterized by malformations of the heart and a bluish skin tone.

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32

Toxic Shock Syndrome

This condition is considered a medical emergency. Urgent care may be required.

Toxic shock syndrome is a rare but serious condition caused by a bacterial infection. Read more about its causes and symptoms and when to see a doctor.

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33

Myocarditis

Myocarditis is inflammation of the heart muscle. It is a rare condition that can be caused by any number of autoimmune diseases, viral, bacterial, or fungal infections, or parasites. When you have an infection or a...

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34

Autonomic Neuropathy

Damage to the nerves that help your organs to function can cause a condition called autonomic neuropathy (AN) and is associated with other conditions.

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35

Wolff-Parkinson-White Syndrome

Wolff-Parkinson-White syndrome is a birth defect in which the heart develops an extra electrical pathway. This can lead to an abnormal heart rate.

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36

Teenage Pregnancy

Teenage pregnancy is pregnancy in a woman 19 years of age or younger. A woman can get pregnant if she has vaginal sex with a man at any age after she has started having regular monthly periods. Some signs of pregnanc...

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37

Primary Pulmonary Hypertension

Primary pulmonary hypertension (PPH) is now known as pulmonary arterial hypertension (PAH). The name was changed in 1998 to pulmonary arterial hypertension (PAH) because it was determined to be more descriptive of th...

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38

Aortic Valve Disease

In aortic valve disease, the valve that controls the flow of blood from your left ventricle (lower left heart chamber) to your aorta (main artery) malfunctions.

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39

Aortic Valve Insufficiency

Aortic valve insufficiency (AVI) is also called aortic insufficiency or aortic regurgitation. This condition develops when the aortic valve is damaged.

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40

Pulmonary Valve Stenosis

Pulmonary valve stenosis is a rare, potentially serious cardiac condition. Read on to learn how it affects the heart and how it's treated.

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This feature is for informational purposes only and should not be used to diagnose.
Please consult a healthcare professional if you have health concerns.
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