This allergy is a reaction to proteins in natural rubber latex — found in medical gloves, balloons and more. Find out how to avoid many common triggers.
Disease
Lazy eye (amblyopia)
Abnormal visual development early in life can cause reduced vision in one eye, which often wanders inward or outward.
Disease
Lead poisoning
Learn about lead poisoning symptoms and treatment of lead exposure in children and adults. Explore ways to keep your kids safe from lead exposure.
Disease
Left ventricular hypertrophy
Learn more about this heart condition that causes the walls of the heart's main pumping chamber to become enlarged and thickened.
Disease
Legg-Calve-Perthes disease
This childhood condition occurs when blood supply to the ball part of the hip joint is interrupted for a short time, making the bone fracture easily and heal poorly.
Disease
Legionnaires' disease
Bacteria that can live in water from air conditioning systems, showers and spas cause this severe form of pneumonia.
Disease
Leiomyosarcoma
Learn about this rare cancer that begins in smooth muscle tissue. Treatments include surgery, radiation therapy and chemotherapy.
Disease
Leukemia
Learn about this cancer that forms in the blood and bone marrow.
Disease
Leukoplakia
This mouth condition appears as thick, white patches on the gums, the cheeks and the bottom of the mouth that cannot be scraped off.
Disease
Lewy body dementia
This common dementia is caused by a buildup of proteins in the brain. It affects thinking, memory and movement.
Disease
Lice
Learn how to get rid of these tiny, wingless insects and keep them from coming back.
Disease
Lichen planus
Learn about the causes, symptoms and treatment of this condition that causes swelling and irritation in the skin, hair, nails, mouth and vagina.