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Let's see if we can figure out what's causing your fatigue.
Select additional symptoms and we'll narrow your results.

What causes fatigue? 251 possible conditions

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

21

Anxiety

Learn more about anxiety with this overview of anxiety disorders.

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22

Hypothyroidism

The thyroid gland produces a hormone that controls how your cells use energy (metabolize). Hypothyroidism occurs when the body doesn't produce enough. Untreated, it can cause complications like obesity and heart disease.

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23

Emphysema

Smoking is the leading cause of emphysema, a disease of the lungs that makes it hard to breathe. Learn more about how emphysema affects you and how it's treated.

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24

Bleeding

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

Bleeding, or hemorrhage, is the name used to describe blood loss. It can refer to blood loss inside the body, called internal bleeding. Or it can refer to blood loss outside of the body, called external bleeding...

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25

Iron Deficiency Anemia

Iron-deficiency anemia is the most common type of anemia, which occurs when the body does not have enough of the mineral iron. The body needs iron to produce hemoglobin.

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26

Seasonal Affective Disorder

Seasonal affective disorder (SAD) is a form of depression. People affected by SAD display symptoms of depression at the same time every year, typically during the fall and winter months. According to the America...

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27

Type 2 Diabetes Overview

The things you've wanted to know about type 2 diabetes are all in one place. Learn more about the symptoms, foods to avoid, and lifestyle management.

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28

Urinary Tract Infection

UTIs are usually caused by bacteria and can occur in any part of the urinary tract. Symptoms of upper UTIs include pain in the upper back, chills, fever, and nausea.

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29

Coronary Artery Disease (CAD) Overview

Coronary artery disease (CAD) is the leading cause of death in the United States. Learn the definition, symptoms, and causes of CAD by reading our overview.

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30

Infectious Mononucleosis

Infectious mononucleosis, or mono, refers to a group of symptoms usually caused by the Epstein-Barr virus (EBV).

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31

Food Poisoning

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

Food poisoning occurs when you consume foods contaminated with bacteria, viruses, or parasites. Symptoms are usually uncomfortable but not severe.

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32

Systemic Lupus Erythematosus

Systemic lupus erythematosus, the most common form of lupus, is a chronic autoimmune disease that can cause severe fatigue and joint pain. Learn more about it.

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33

Pregnancy

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

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34

Radiculopathy

Radiculopathy, or a pinched nerve of the spine, can cause pain in various parts of your body. Learn more about treating and preventing this condition.

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35

Sinus Infections (Sinusitis)

A sinus infection, or sinusitis, is a common condition that affects 30 million people in the United States each year, according to the National Institute of Allergy and Infectious Diseases. The infection occurs whe...

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36

Diabetes Overview

Diabetes is a group of chronic metabolic diseases caused by defects in insulin production or function. Advanced diabetes may cause stomach pain, nausea, dizziness, and cramps.

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37

Pneumonia

Pneumonia is an infection of the lungs caused by fungi, bacteria, or viruses. General symptoms include chest pain, fever, cough, and difficulty breathing.

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38

Becker Muscular Dystrophy

Becker muscular dystrophy is a genetic condition that damages muscles over time and results in tissue loss. Read about symptoms and treatment.

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39

Duchenne Muscular Dystrophy

One of the nine types of muscular dystrophy, Duchenne muscular dystrophy (DMD) is a genetic condition characterized by progressive weakening of voluntary muscles that leads to death. DMD worsens more rapidly than othe...

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40

Cellulitis

Cellulitis is a common bacterial skin infection. Cellulitis may first appear as a red, swollen area that feels hot and tender to the touch.

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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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