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Knee Osteoarthritis
Knee osteoarthritis is a disease in which cartilage and other tissues in the knee gradually break down and remodel. These changes can…
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Kyphosis
Kyphosis is an excessive outward curve of the upper spine that can make the back look rounded or hunched. The thoracic spine…
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Large Granular Lymphocytic Leukemia
Large Granular Lymphocytic Leukemia is a rare blood cancer involving abnormal cytotoxic T cells or natural killer (NK) cells. These immune cells,…
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Lateral Hernia
A lateral hernia is tissue or part of the intestine pushing through a weak area on the side of the abdominal wall.…
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Left Ventricular Aneurysm
A left ventricular aneurysm is a weakened area of the left ventricle, the heart’s main pumping chamber, that bulges outward. It most…
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Legionellosis
Legionellosis is an infection caused by Legionella bacteria, which can grow in certain water systems and reach people through contaminated droplets or…
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Leprosy
Leprosy is a bacterial disease that mainly affects the skin and peripheral nerves, the nerves outside the brain and spinal cord. It…
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Leptospirosis
Leptospirosis is a bacterial infection caused by Leptospira bacteria. It can range from a mild illness with flu-like symptoms to severe disease…
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Lethal Arrhythmia
A lethal arrhythmia is a dangerously fast, slow, or chaotic heart rhythm that can prevent the heart from pumping enough blood to…
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Leukemia
Leukemia is a cancer that begins in blood-forming tissues, especially the bone marrow. It causes abnormal blood cells to grow or survive…
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Lip Cancer
Lip cancer is a growth of abnormal cells in the lip that can damage nearby tissue. It may begin in the outer…
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Listeriosis
Listeriosis is a foodborne infection caused by the bacterium Listeria monocytogenes. It may cause a mild intestinal illness with diarrhea and vomiting,…
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Liver Cancer
Liver cancer is a disease in which abnormal cells grow uncontrollably in the liver and form a tumor. It can affect people…
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Liver Cyst
A liver cyst is a fluid-filled sac in or on the liver. Many simple cysts are benign, meaning they are not cancerous…
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Lobomycosis
Lobomycosis is a rare, chronic fungal infection of the skin and underlying tissue caused by Lacazia loboi. It often affects exposed areas…
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Lung Cancer
Lung cancer begins when abnormal cells in lung tissue grow uncontrollably and form a tumor. It can affect people who smoke, people…
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Lyme Borreliosis
Lyme borreliosis, also called Lyme disease or borreliosis disease, is a bacterial infection caused by certain Borrelia bacteria. It is usually transmitted…
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Lymphangitis
Lymphangitis is inflammation and infection of one or more lymphatic vessels, which help move fluid and immune cells through the body. It…
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Lymphocytic Leukemia
Lymphocytic leukemia is a cancer of lymphocytes, a type of white blood cell that helps the immune system fight infection. This page…
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Lymphoma
Lymphoma is a cancer that starts in lymphocytes, a type of white blood cell in the lymphatic system. This system includes lymph…
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Lynch Syndrome
Lynch syndrome is an inherited condition that increases a person's risk of developing colorectal and several other cancers. It results from changes…
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Macular Degeneration
Macular degeneration is an eye disease that damages the macula, the central part of the retina responsible for sharp, detailed vision. It…
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Malaria
Malaria is an illness caused by Plasmodium parasites that infect red blood cells. Infected female Anopheles mosquitoes can transmit the parasites when…
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Maturity-Onset Diabetes Of The Young
Maturity-onset diabetes of the young (MODY) is an inherited form of diabetes caused by a change in a single gene. It often…
