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What causes fatigue and palpitations? 25 possible conditions

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


Low Blood Sugar (Hypoglycemia)

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

Also known as hypoglycemia, low blood sugar can be a dangerous condition. Hypoglycemia is rare in people who are not suffering from diabetes, the chronic disease that affects the body's ability to regulate blood sugar...

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What is anxiety? Anxiety often manifests itself as an apprehension about daily life. Learn the basics with this overview of the types of anxiety disorders.

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Hyperventilation happens when you suddenly start breathing very quickly. Exhaling more than you inhale causes low carbon dioxide levels.

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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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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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Paroxysmal Supraventricular Tachycardia (PSVT)

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

Paroxysmal supraventricular tachycardia (PSVT) is a faster-than-normal heart rate. It can last from a few minutes to several hours. PSVT is a fairly common type of (arrhythmia) that can occur in a person of any age.

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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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Heart Failure

Right-side heart failure occurs when the right ventricle can't properly pump blood to your lungs to collect oxygen. Excessive fatigue, shortness of breath and abdominal bloating are signs.

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Sick Sinus Syndrome

Sick sinus syndrome (SSS) is a general name for a group of disorders caused by a malfunctioning sinus node. The sinus node acts as a pacemaker inside the heart. Sinus rhythm (the normal beating of the heart) i...

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High Blood Pressure Overview

High blood pressure (hypertension) increases your risk for heart attack, stroke, coronary heart disease, and other serious health problems. Left untreated, high blood pressure can damage blood vessels and vital organs.

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

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Congestive (Dilated) Cardiomyopathy

Congestive cardiomyopathy, also known as dilated cardiomyopathy, is characterized by a weak primary pumping chamber in the heart. Your heart automatically attempts to correct for this inefficiency. In turn, thi...

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Mitral Valve Prolapse

Your mitral valve is located on the left side of your heart, between two chambers, the atrium and the ventricle. Blood is pumped from the left atrium through the mitral valve and into the left ventricle on its way t...

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Generalized Anxiety Disorder

People who suffer from generalized anxiety disorder, or GAD, worry uncontrollably about common occurrences and situations. The condition may also be called chronic anxiety neurosis.GAD is different than normal feeling...

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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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Ventricular Septal Defects

A ventral septal defect (VSD) is a hole between the heart's lower chambers (ventricles). It can lead to difficulty breathing and pale or bluish skin, especially around the lips and fingernails.

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Mitral Valve Stenosis

Mitral valve stenosis, also known as mitral stenosis, is when the mitral valve opening is narrowed. This means that not enough blood can flow through it.

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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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Ischemic Cardiomyopathy

Ischemic cardiomyopathy is a condition that occurs when the heart muscle is weakened due to insufficient blood flow to the heart's muscle. This inhibits the heart's ability to pump blood and can lead to heart failure.

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Learn about sarcoidosis and its causes, symptoms, diagnosis, treatment, and potential complications.

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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.