Fast heart rate, Palpitations: 18 Possible Causes
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What causes fast heart rate and palpitations? 18 possible conditions

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

1

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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2

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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3

Hyperthyroidism

The thyroid gland produces a hormone that controls how your cells use energy. Hyperthyroidism occurs when the body produces excessive amounts.

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4

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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5

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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6

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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7

High Blood Pressure Overview

High blood pressure (hypertension) increases your risk for heart attack, stroke, coronary heart disease, and other serious health problems.

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8

Septic Shock

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

Septic shock is a complication of an infection. It can cause inflammation and could become life-threatening.

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9

Mitral Valve Prolapse

In mitral valve prolapse the flaps of the heart's mitral valve do not close correctly, which can make blood leak from one chamber into another. Lifelong heart abnormalities likely contribute to this condition.

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10

Hypertensive Heart Disease

Hypertensive heart disease refers to heart conditions caused by high blood pressure. Possible signs of acute hypertension include sweating and chills.

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11

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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12

Thyroid Storm

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

Thyroid storm is a life-threatening condition that results from undertreated or untreated hyperthyroidism. Persistent sweating is one possible sign of thyroid storm.

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13

Ventricular Septal Defects

A ventricular septal defect (VSD) is a hole between your heart's lower chambers, or ventricles. Read more about this condition.

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14

The Deadly Potential of Digitalis: Digitalis Toxicity

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

Digitalis toxicity occurs when you take too much digitalis, a medication used to treat heart conditions.

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15

Congestive Heart Failure (CHF)

Congestive heart failure (CHF) is a chronic condition that affects the chambers of your heart. CHF refers to fluid buildup around your heart.

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16

Agoraphobia

Agoraphobia is an anxiety disorder that makes people very fearful of certain places and situations. Learn about agoraphobia causes, symptoms, and treatment.

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17

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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18

Alcoholic Cardiomyopathy

Alcoholic cardiomyopathy is a form of heart disease caused by alcohol abuse. Long-term alcohol abuse weakens and thins the heart muscle. The damaged muscle cannot pump blood as it should, which deprives the bod...

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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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