Fainting: Causes, Types & Prevention
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What causes fainting? 41 possible conditions

Fainting happens when you lose consciousness for a short amount of time because your brain isn’t getting enough oxygen. The medical term for fainting is syncope Read more

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

1

Seizures

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

Seizures are changes in the brain's electrical activity. This change can cause dramatic, noticeable symptoms or it may not cause any symptoms. The symptoms of a severe seizure include violent shaking and a loss o...

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2

Heart Attack Overview

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

A clot blocks the blood flow to the heart (heart attack), and damages heart muscle. Symptoms include chest pain, shortness of breath, and a blue or grey tinge to the skin.

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3

Low Blood Sugar (Hypoglycemia)

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

Hypoglycemia, or low blood sugar, is a potentially dangerous condition that's most common in people with diabetes. Learn what causes it and how to prevent it.

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4

Hypotension

Hypotension is low blood pressure. That's good in most cases, but low blood pressure can sometimes make you feel tired or dizzy.

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5

Drug Allergy Overview

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

A drug allergy is an allergic reaction to a medication. Your immune system identifies the drug as foreign and acts to eliminate it from your body.

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6

Food Allergy Basics

Food allergies are overblown responses by the immune system to foods that aren't typically harmful - like eggs and peanuts. Continue reading and learn more about food allergies, and how to prevent or treat sever...

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7

Panic Disorder

Panic disorder occurs when you live in fear of a panic attack. You may be having a panic attack when you feel sudden, overwhelming terror with no obvious cause.

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8

Pregnancy

Bleeding or spotting, increased need to urinate, tender breasts, fatigue, nausea, and missed period are signs of pregnancy.

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9

Anorexia Nervosa

Anorexia nervosa is an eating disorder that can result in severe weight loss. Learn more about warning signs and treatment.

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10

Abnormal Heart Rhythms

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

An abnormal heart rhythm is when your heart beats too fast, slow, or irregularly. This is also called an arrhythmia. Within the heart is a complex system of valves, nodes, and chambers that control how and when th...

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11

Ventricular Tachycardia

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

Ventricular tachycardia is a very fast heart rhythm that begins in the ventricles. Learn about ventricular tachycardia symptoms, causes, and diagnosis.

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12

Pulmonary Embolism

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

A pulmonary embolism is a blood clot that occurs in the lungs. It can damage part of the lung and other organs and decrease oxygen levels in the blood.

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13

The Catastrophy of Cardiac Tamponade

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

Cardiac tamponade is a very serious condition in which your heart can't pump enough blood to your body due to fluid buildup around your heart.

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14

Sick Sinus Syndrome

Sick sinus syndrome is a general name for a group of disorders that can cause abnormal beating of the heart. Read about symptoms and treatment options.

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15

Peripheral Neuropathy

Peripheral neuropathy is a disorder that occurs when your peripheral nerves malfunction because they're damaged.

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16

Cardiomyopathy

Cardiomyopathy is a progressive disease of the heart muscle. Learn about the types, symptoms, treatment, and prognosis of this disease.

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17

Alcoholic Liver Disease

Damage to the liver from excessive drinking can lead to ALD. Years of alcohol abuse cause the liver to become inflamed and swollen. This damage can also cause scarring known as cirrhosis. Cirrhosis is the final stage o...

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18

Ectopic Pregnancy

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

Ectopic pregnancies occur when a fertilized egg fails to attach to the uterus. In most ectopic pregnancies, the egg will attach to the fallopian tubes. Less common, it may also attach to the abdominal cavity or cervix...

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19

Atrial Fibrillation and Flutter

Atrial fibrillation and atrial flutter are irregular heart rhythms that occur when the upper chambers of your heart (the atria) beat too fast.Atrial fibrillation can be sustained or can occur in bursts. It creates a...

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20

Paroxysmal Supraventricular Tachycardia (PSVT)

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

People with paroxysmal supraventricular tachycardia (PVST) experience a faster-than-normal heart rate. Learn more about the symptoms and risk factors.

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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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