Leiomyosarcoma is a rare and aggressive type of cancer that develops from smooth muscle cells. Smooth muscles are found in many parts of the body, including the uterus, blood vessels, digestive tract, and other internal organs. Because smooth muscle exists throughout the body, leiomyosarcoma can occur in different locations. This cancer often grows quickly and may spread to other parts …

Legionnaires’ disease is a severe form of pneumonia caused by Legionella bacteria. These bacteria are commonly found in freshwater environments but can become a health risk when they grow and spread in man-made water systems such as cooling towers, hot tubs, plumbing systems, and decorative fountains. People usually get Legionnaires’ disease by breathing in small droplets of water that contain …

Legg-Calve-Perthes disease is a childhood condition that affects the hip joint. It occurs when the blood supply to the rounded head of the thigh bone, called the femoral head, is temporarily interrupted. Without enough blood flow, the bone weakens and can break down, leading to changes in the shape of the hip joint. The condition most often affects children between …

Left ventricular hypertrophy is a condition in which the muscular wall of the heart’s main pumping chamber, called the left ventricle, becomes thickened. This thickening usually develops as a response to increased workload on the heart, most commonly from high blood pressure or heart valve disease. While the heart muscle may initially thicken to help pump blood more effectively, over …

Lead poisoning occurs when lead builds up in the body over time, often due to repeated exposure. Lead is a toxic metal that can cause serious health problems, especially in young children, whose developing brains and nervous systems are particularly vulnerable. Even small amounts of lead can be harmful. Lead exposure commonly happens through contaminated paint, dust, soil, water, or …

Lobular carcinoma in situ is a noninvasive breast condition in which abnormal cells are found in the lobules, the milk-producing glands of the breast. Despite its name, lobular carcinoma in situ is not a true cancer but rather a marker indicating an increased risk of developing invasive breast cancer in the future. It is often discovered incidentally during a breast …

Lactose intolerance is a digestive condition in which the body is unable to fully digest lactose, a natural sugar found in milk and dairy products. This happens when the small intestine does not produce enough lactase, the enzyme needed to break down lactose into simpler sugars that can be absorbed into the bloodstream. When lactose is not properly digested, it …

Knee pain is a common condition that affects people of all ages and can range from mild discomfort to severe pain that interferes with daily activities. It may result from injury, overuse, aging, or underlying medical conditions. Knee pain can involve bones, cartilage, ligaments, tendons, or surrounding muscles, and proper evaluation is important to determine the cause. Symptoms Symptoms of …

Klippel-Trenaunay syndrome is a rare congenital vascular disorder present at birth. It is characterized by abnormal development of blood vessels, soft tissues, and bones, most commonly affecting one limb. The condition is not inherited and usually occurs due to a genetic change during early fetal development. Symptoms and severity vary widely among individuals. Symptoms Symptoms of Klippel-Trenaunay syndrome are usually …

Klinefelter syndrome is a genetic condition that affects males and occurs when an individual is born with one or more extra X chromosomes, most commonly 47,XXY instead of the typical 46,XY. The condition can affect physical development, hormone levels, and fertility. Many individuals with Klinefelter syndrome are not diagnosed until adolescence or adulthood due to mild or subtle symptoms. Symptoms …