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Diseases & Conditions

Latex allergy

This allergy is a reaction to proteins in natural rubber latex — found in medical…

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Lazy eye (amblyopia)

Abnormal visual development early in life can cause reduced vision in one eye, which often…

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Lead poisoning

Learn about lead poisoning symptoms and treatment of lead exposure in children and adults. Explore…

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Learning disorders: Know the signs, how to help

Here's how to find out what's going on if your child often has trouble with…

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Lecanemab for Alzheimer's disease: An option for you?

Learn whether the Alzheimer's disease medicine lecanemab may be a treatment for you.

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Left ventricular hypertrophy

Learn more about this heart condition that causes the walls of the heart's main pumping…

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Leg cramps during pregnancy: Preventable?

A Mayo Clinic specialist shares prevention and treatment tips for leg cramps during pregnancy.

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Leg pain

Leg pain: Symptom — Overview covers definition, possible causes of this symptom.

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Leg pain after prolonged standing or sitting

New, persistent leg pain or aching may indicate an underlying circulation problem.

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Leg swelling

Leg swelling is a common sign of fluid buildup. It might happen from standing or…

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Legg-Calve-Perthes disease

This childhood condition occurs when blood supply to the ball part of the hip joint…

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Legionnaires' disease

Bacteria that can live in water from air conditioning systems, showers and spas cause this…

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Leiomyosarcoma

Learn about this rare cancer that begins in smooth muscle tissue. Treatments include surgery, radiation…

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Leukemia

Learn about this cancer that forms in the blood and bone marrow.

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Leukoplakia

This mouth condition appears as thick, white patches on the gums, the cheeks and the…

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Lewy body dementia

This common dementia is caused by a buildup of proteins in the brain. It affects…

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Lice

Learn how to get rid of these tiny, wingless insects and keep them from coming…

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Lichen planus

Learn about the causes, symptoms and treatment of this condition that causes swelling and irritation…

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Lichen sclerosus

Learn more about the causes, symptoms, complications, treatment and self-care tips for this blotchy skin…

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Limbic-predominant age-related TDP-43 encephalopathy (LATE)

LATE causes symptoms similar to Alzheimer's, but may progress more slowly.

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Lip cancer

Lip cancer often appears as a sore on your lip that doesn't heal. Learn about…

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Lipoma

This slow-growing, fatty lump most often is just below the skin. It isn't cancer and…

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Liposarcoma

Learn about diagnosis and treatment options for this type of soft tissue sarcoma that forms…

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Liposuction

Learn about this surgery that removes fat and shapes areas of the body. Understand the…

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Listeria infection

This illness is caused by bacteria that spreads in food. It can be very serious…

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Livedo reticularis: When is it a concern?

Learn when this condition that causes a lacy pattern on the skin is simply a…

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Liver biopsy

Examining liver tissue can be a vital step in diagnosing and treating many liver conditions.…

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Liver cancer

Learn how doctors use surgery, liver transplant, radiation, chemotherapy and other methods to treat hepatocellular…

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Liver cysts: A cause of stomach pain?

Occasionally, liver cysts can cause pain and discomfort in the upper abdomen.

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Liver disease

The liver has a lot of vital tasks including ridding the body of toxins. Learn…

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