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.



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.

Read more »



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.

Read more »



Emphysema is a lung disease that, along with chronic bronchitis, represents a type of chronic obstructive pulmonary disease (COPD). Lack of oxygen may give skin and lips a bluish hue.

Read more »



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

Bleeding can refer to blood loss inside the body (internal bleeding) or blood loss outside of the body (external bleeding). It can cause bruising, pain, and symptoms of shock. Too much bleeding can lead to death.

Read more »


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.

Read more »


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...

Read more »


Type 2 Diabetes Overview

Type 2 diabetes is a common chronic metabolic disease that leads to abnormally high levels of blood sugar in the blood. This blood sugar is also referred to as glucose.

Read more »


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.

Read more »


Coronary Artery Disease (CAD) Overview

CAD occurs when one or more of the coronary arteries begin to narrow due to the build-up of cholesterol and plaque. The blockage of one of these arteries leads to a heart attack.

Read more »


Infectious Mononucleosis

Infectious mononucleosis, or "mono," is a group of symptoms caused by the Epstein-Barr virus. One potential symptom is a pink rash that looks like the measles.

Read more »


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.

Read more »


Systemic Lupus Erythematosus

Systemic lupus erythematosus (SLE) is an autoimmune disease and the most common type of lupus. One of its common symptoms is a rash on the cheeks and nose called a "butterfly rash."

Read more »



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

Read more »



Radiculopathy refers to disease of the spinal nerve roots. Radiculopathy produces pain , numbness, or weakness radiating from the spine.

Read more »


Sinus Infections (Sinusitis)

A sinus infection causes the sinuses and nasal passages to become inflamed. Facial swelling is a common sign of this type of infection.

Read more »


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.

Read more »



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

Read more »


Becker Muscular Dystrophy

Becker muscular dystrophy is a genetic condition that causes muscles to become damaged and weakened over time, resulting in loss of muscle tissue.

Read more »


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...

Read more »



Cellulitis is a common, often painful skin infection that first appears as a red, swollen area that feels hot and tender to the touch. If left untreated, it can become life-threatening.

Read more »

This feature is for informational purposes only and should not be used to diagnose.
Please consult a healthcare professional if you have health concerns.