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

    Labyrinthitis is a condition that affects a part of the inner ear called the labyrinth. When it is swollen, you…

  • Lactose Intolerance

    Lactose intolerance is a condition that causes stomach discomfort. It’s your body reacting to the sugar in milk (or other…

  • A doctor wearing blue latex gloves

    Latex Allergy

    Natural rubber latex comes from a liquid in tropical rubber trees. The protein in this rubber can cause an allergic…

  • Leprosy

    Leprosy is a chronic infection caused by bacteria. It can affect the skin, nerves of the hands and feet, eyes,…

  • Leukemia

    Leukemia is a blood cancer involving your body’s bone marrow.

  • Man scratching an itch on his wrist

    Lichen Planus

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

  • woman with hands holding her crotch

    Lichen Sclerosus

    Lichen sclerosus is a skin condition that affects the genital or anal areas. It can cause a rash, itching, pain,…

  • a lipoma under the skin by the elbow


    Lipomas are slow-growing tumors that come from fat cells. They are usually round, moveable lumps under the skin.

  • Athletic woman standing outside, rubbing lower back muscles

    Low Back Pain

    Low back pain is common and has many causes, including injury, pregnancy, even poor posture.

  • A man in office clothes holding his back in pain

    Lumbar Spinal Canal Stenosis

    As the lumbar spinal canal narrows (stenosis), the nerves that go through it are squeezed, causing back pain, leg pain,…

  • Female doctor examines X-ray of a patient’s lungs

    Lung Cancer

    Lung cancer is abnormal growth of cells in the lungs.

  • Lupus

    Lupus is a disease that causes your immune system to become overactive and attack healthy cells and tissue. Lupus can…

  • Lyme Disease

    Lyme disease is a bacterial infection caused by a tick bite.

  • an excess buildup of fluid in the ankle causing swelling


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