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Disease

Food allergy

For people with food allergies, symptoms can range from annoying to life-threatening. Learn about diagnosis and treatment of this common immune reaction.
Disease

Generalized anxiety disorder

Excessive, ongoing anxiety and worry can interfere with your daily activities and may be a sign of generalized anxiety disorder, but treatment can help.
Disease

Geographic atrophy

This serious eye condition can occur in people with macular degeneration. Find out about its symptoms and treatments.
Disease

Giant cell arteritis

Head pain and tenderness are the most common symptoms of giant cell arteritis, an inflammation of the lining of your arteries.
Disease

Granuloma annulare

Learn about this painless skin condition mainly affecting young adults in which bumps form a ring. The rash can be long lasting or recur after treatment.
Disease

HIV/AIDS

Learn more about this potentially life-threatening infection that spreads through blood, sex and childbirth. Know how to prevent and treat it.
Disease

Heart arrhythmia

Learn about common heart rhythm disorders that can cause your heart to beat too fast, too slow or irregularly.
Disease

Heart attack

A blockage of blood flow to the heart can damage or destroy heart muscle.
Disease

Hives and angioedema

Learn more about these common but short-lived skin conditions, their symptoms, causes and home remedies, and how to prevent them.
Disease

Illness anxiety disorder

Excessive worry that you're seriously ill based on minor symptoms can result in major emotional distress and disrupt your life. Also called hypochondria.
Disease

Iron deficiency anemia

Not getting enough iron can lead to this condition, which can cause tiredness and shortness of breath.
Disease

Juvenile idiopathic arthritis

Learn about this type of arthritis that affects children and can cause growth problems, joint damage and eye inflammation.
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