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A kidney transplant is an operation that places a healthy kidney in your body. The transplanted kidney takes over the work of the two kidneys that failed, ...
What is knee replacement surgery? Knee replacement surgery is a surgery to replace parts of your knee joint with new, artificial parts. You may need a ...
Laboratory tests check a sample of your blood, urine, or body tissues. A technician or your doctor analyzes the test samples to see if your results fall within ...
What is cholesterol? Cholesterol is a waxy, fat-like substance that's found in all the cells in your body. Your liver makes cholesterol, and it is also ...
What is a learning disability? Learning disabilities are conditions that affect the ability to learn. They can cause problems with: Understanding what ...
What is Legionnaires' Disease? Legionnaires' disease is a serious type of pneumonia caused by Legionella bacteria. The disease got its name when a group ...
What is leukemia? Leukemia is a term for cancers of the blood cells. Leukemia starts in blood-forming tissues such as the bone marrow. Your bone marrow ...
What are leukodystrophies? Leukodystrophies are a group of rare genetic disorders that affect the central nervous system (CNS). The CNS is made up of your ...
What is Lewy body dementia (LBD)? Lewy body dementia (LBD) is one of the most common types of dementia in older adults. Dementia is a loss of mental functions ...
Your liver is the largest organ inside your body. It helps your body digest food, store energy, and remove poisons. You cannot live without a liver that works. ...
What are HIV and AIDS? HIV stands for human immunodeficiency virus. It harms your immune system by destroying a type of white blood cell that helps your ...
What is lung cancer? Lung cancer is cancer that forms in tissues of the lung, usually in the cells that line the air passages. It is the leading cause ...
What is lupus? Lupus is a chronic (long-lasting) type of autoimmune disease.Autoimmune diseases happen when your immune system attacks healthy cells and ...
What is Lyme disease? Lyme disease is a bacterial infection you get from the bite of an infected tick. At first, Lyme disease usually causes symptoms ...
Lymphoma is a cancer of a part of the immune system called the lymph system. There are many types of lymphoma. One type is Hodgkin disease. The rest are called ...
What is a mammogram? A mammogram is an x-ray picture of the breast. Health care providers use mammograms to look for early signs of breast cancer. There ...
What is marijuana? Marijuana is a green, brown, or gray mix of dried, crumbled parts from the marijuana plant. The plant contains chemicals which act ...
Children aren't just small adults. It is especially important to remember this when giving medicines to children. Giving a child the wrong dose or a medicine ...
Melanoma is the most serious type of skin cancer. Often the first sign of melanoma is a change in the size, shape, color, or feel of a mole. Most melanomas have ...
What is meningococcal disease? Meningococcal disease is the name for any illness that is caused by Neisseria meningitidis bacteria (also called meningococcal ...
