Fainting, Lightheadedness: 16 Possible Causes
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What causes fainting and lightheadedness? 16 possible conditions

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

1

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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2

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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3

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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4

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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5

Pregnancy

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

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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

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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8

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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9

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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10

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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11

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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12

Hyperemesis Gravidarum

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

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13

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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14

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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15

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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16

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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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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