Diseases and Conditions

Find doctor-approved information about symptoms, causes, diagnosis, treatment and prevention of common diseases and conditions.

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All conditions that start with the letter L
  • Labyrinthitis

    Learn about the symptoms of and treatments for labyrinthitis.

  • Lactose Intolerance

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

  • Latex Allergy

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

  • Leprosy

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

  • Leukemia

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

  • Lichen Planus

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

  • Lichen Sclerosus

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

  • Lipomas

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

  • Low Back Pain

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

  • Lumbar Spinal Canal Stenosis

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

  • Lung Cancer

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

  • Lupus

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

  • Lyme Disease

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

  • Lymphedema

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