Learn how this cancer differs from other lymphomas. Find out about risk factors and treatments, such as chemotherapy, radiation and bone marrow transplant.
Disease
Hypoplastic left heart syndrome
Learn more about this rare congenital heart defect that causes the left side of the heart to not develop fully and be small.
Disease
Interstitial lung disease
This group of lung diseases cause progressive lung tissue scarring and affect your ability to breathe and get enough oxygen into your bloodstream.
Disease
Invasive lobular carcinoma
Breast cancer that begins in the milk-producing glands of the breast is uncommon. Learn what sets lobular carcinoma apart from other breast cancer types.
Disease
Jet lag disorder
Jetting across time zones can take a toll on your body's internal clock. Find out how to cope with fatigue and other symptoms while traveling.
Disease
Lactose intolerance
Not being able to fully digest the sugar (lactose) in milk can lead to diarrhea, gas and bloating after eating or drinking dairy products.
Disease
Laryngitis
Learn about the symptoms, causes and treatment for this common irritation of the voice box.
Disease
Latex allergy
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.