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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.


Multifocal Atrial Tachycardia and Your Heart

In multifocal atrial tachycardia (MAT), the upper heart chambers send electrical signals through too many pathways to the lower chambers, causing the heart beats much faster than normal. This can lead to rapid pulse an...

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Hyperemesis Gravidarum

Hyperemesis gravidarum is an extreme form of morning sickness that causes severe and persistent nausea and vomiting during pregnancy. It can cause complications to the pregnancy due to weight loss and dehydration.

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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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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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Carbon Monoxide Poisoning

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

Carbon monoxide poisoning occurs when we inhale too much carbon monoxide. It can lead to tissue damage and possibly death. Signs include a dull headache, nausea, confusion, and blue lips or skin.

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Fertilizer and Plant Food Poisoning

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

Plant foods can be hazardous to people and pets through physical contact, inhalation, or accidental ingestion. Contact may result in burning, itchy, and red skin.

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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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Post Traumatic Stress Disorder (PTSD)

Post-traumatic stress disorder (PTSD) is an anxiety disorder that occurs after experiencing or witnessing a traumatic event. PTSD can cause disruptive symptoms of panic, increased arousal, and mental/emotional problems.

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Hypertrophic Cardiomyopathy

Hypertrophic cardiomyopathy (HCM) occurs when the heart muscle (myocardium) becomes thicker than normal. This interferes with your heart's ability to pump blood. Possible symptoms are dizziness, chest pain, and more.

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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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Tetralogy of Fallot (TOF)

Tetralogy of Fallot is a congenital heart defect that can be fatal if left untreated. Symptoms are present at birth and include bluish-colored skin, clubbed fingers, and developmental delays.

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Toxic Shock Syndrome

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

Toxic shock syndrome is a rare, serious condition caused by a bacterial infection. Rash is one of several common signs for this symptom.

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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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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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Wolff-Parkinson-White Syndrome

Wolff-Parkinson-White syndrome is a birth defect in which the heart develops an extra electrical pathway. The first sign of WPW syndrome is usually a rapid heart rate. Other symptoms are short breath, fatigue, and more.

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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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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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Aortic Valve Disease

Aortic valve disease is a condition that occurs when the main artery of your body, the aorta, and the left ventricle of the heart malfunction. The aortic valve determines how blood flows from the left ventricle (th...

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Aortic Valve Insufficiency

Aortic valve insufficiency (AVI), is also called aortic insufficiency or aortic regurgitation. This condition indicates damage to the aortic valve. AVI affects one out of every 10,000 people between the ages of 30 an...

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Pulmonary Valve Stenosis

Your pulmonary valve rests between your right ventricle and your pulmonary artery, which sends oxygen-poor blood to your lungs. The valve acts as a doorway that lets blood into and out of your heart. If your pulmonar...

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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.