Diseases and Conditions

Learn about the symptoms of and treatments for labyrinthitis.

Lactose intolerance means your body cannot tolerate the sugar in milk and other dairy products.

The protein in rubber latex can cause an allergic reaction in some people. This reaction can range from sneezing to…

Leprosy is a chronic infection caused by Mycobacterium leprae bacteria. If left untreated, it can cause deformities of the hands…

Leukemia is cancer of the white blood cells. There are 4 main types that have different symptoms and treatments.

Lichen planus is a type of rash that forms on your skin, on genitalia, or in your mouth. Learn about…

Lichen sclerosus is a skin condition that often affects your genital or anal areas. It is most common in women…

Lipomas are benign (not cancerous), slow-growing tumors that come from fat cells. They are usually round, moveable, flattened lumps under…

Low back pain is common. But you can learn to prevent it or reduce the frequency of pain.

Lumbar spinal canal stenosis is the narrowing of the space inside the lower spine that carries nerves to your legs…

Lung cancer is one of the world’s most common cancers. It is the deadliest cancer in the United States. Most…

Learn about the different types of lupus, as well as the main symptoms, causes, and treatments.

Lyme disease is a bacterial infection spread by ticks. It can cause fever, joint and muscle aches, and a “bull’s-eye”…

Lymphedema is a condition often caused by cancer treatment or surgery. It results in swelling of the lymph nodes located…