This joint pain is triggered by an infection in another part of the body — often the intestines, genitals or urinary tract.
Disease
Cancer
Find out the basics about cancer, including symptoms, causes and treatments. Learn steps you can take to prevent cancer.
Disease
Hearing loss
Age- and noise-related hearing loss are common and can affect quality of life. But many treatments are available.
Disease
Lung cancer
Learn about the symptoms, diagnosis and treatment for this deadly form of cancer.
Disease
Sudden cardiac arrest
This medical emergency involves sudden loss of all heart activity. Learn how fast, appropriate care may help prevent death.
Disease
Growing pains
Learn about this common condition involving leg pain in children, including growing pain symptoms and how to ease discomfort.
Disease
Metachromatic leukodystrophy
This rare genetic disorder causes fatty substances (sulfatides) to build up in your brain and nervous system, causing progressive loss of nerve function.
Disease
Angelman syndrome
Learn about this genetic disorder that causes developmental delays, problems with speech and other symptoms.
Disease
Chronic granulomatous disease
Learn about this inherited disease, usually diagnosed in childhood, that makes it difficult for your body to fight infections.
Disease
Polycystic kidney disease
Learn how treatments and lifestyle changes might help reduce kidney damage from this disease.
Disease
Colic
Consoling a baby who cries a lot for no known reason is tough. Learn ways to care for the infant and cope with the stress.
Disease
Milk allergy
Find out what happens when the immune system reacts to proteins in milk, causing allergic signs and symptoms such as hives and wheezing.