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What causes joint pain? 101 possible conditions

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


Hemophilia A

Hemophilia A is the most common form of the blood clotting disorder hemophilia. According to the National Heart, Lung and Blood Institute, nine out of 10 people with hemophilia have hemophilia A (<...

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Lead Poisoning

Lead is a toxic metal and a very strong poison. Lead poisoning is serious and sometimes fatal. Discover the causes, treatments, and tips for prevention.

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Kawasaki Disease

Early treatment is key to treating Kawasaki disease, especially in children. Learn how to recognize the symptoms of Kawasaki disease and when to see a doctor.

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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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Christmas Disease (Hemophilia B)

Also called hemophilia B or factor IX hemophilia, Christmas disease is a rare genetic disorder in which your blood does not clot properly. A common symptom is unexplained or excessive bruising.

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Histoplasmosis is a type of lung infection. It is caused by inhaling fungal spores. Spores are found in soil and in the droppings of bats and birds.

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Mumps is a contagious disease caused by a virus that passes from one person to another through saliva, nasal secretions, and close personal contact.

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Legionnaires' Disease

Legionnaires' disease is a severe type of pneumonia, or lung infection. Learn about its symptoms, causes, treatment, and prevention.

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Valley Fever (Coccidioidomycosis)

Valley fever is an infection caused by the Coccidioides fungus. Learn about valley fever symptoms, causes, treatment, prevention, and more.

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Typhus is caused by bacteria transmitted by flea, mite, louse, or tick bites. Scratching the bite opens the skin and allows the bacteria to enter the bloodstream.

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German Measles (Rubella)

German measles, also known as rubella, is a viral infection. Learn about German measles symptoms, causes, diagnosis, treatment, and prevention.

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Weils Disease

Weil's disease is a severe form of the bacterial infection leptospirosis. Learn how to lower your risk of getting this potentially life-threatening illness.

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Hyperparathyroidism is a condition where the parathyroid glands produce too much parathyroid hormone (PTH).

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Infective Endocarditis

Infective endocarditis is an infection in the heart valves or endocardium. It can lead to stroke and heart failure. Read about the symptoms and treatments.

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Dengue Fever

Dengue fever is a disease that affects much of the tropical region and is caused by one of four dengue viruses. A skin rash between two and five days after the initial fever is a common symptom.

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Hepatitis C

Hepatitis C is a disease that causes inflammation and infection of the liver. Read more about this disease that affects millions of people worldwide.

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Whipple's Disease

Bacteria cause Whipple's disease. This disease can make it difficult for your body to absorb nutrients. Learn about its symptoms.

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Hepatitis D

Hepatitis D is an infection that causes the liver to become inflamed. Learn about hepatitis D symptoms, risk factors, diagnosis, and treatment.

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Aspergillosis is an infection, allergic reaction, or fungal growth caused by the Aspergillus fungus.

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Ebola Virus and Disease

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

Ebola disease is a rare, often fatal illness. One of its late-stage symptoms is a bleeding rash over the entire body.

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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.