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What is osteochondritis dissecans? Osteochondritis dissecans (OC) is a joint problem. It occurs when an area of bone under a piece of cartilage in the joint dies. This happens because of a loss of ...

What is lichen planus? Lichen planus is a type of rash that forms on your skin, on genitalia, or in your mouth. It is marked by purple bumps that are flat and uneven in size. The bumps may have whi...

What is long COVID? Long COVID, also called post-COVID-19 condition or post-acute sequelae of SARS-CoV-2 infection (PASC), happens when symptoms continue for 4 weeks or more after the initial COVID...

What is Lyme disease? Lyme disease is a bacterial infection that is caused by a tick bite. It was first recognized in 1975 when large numbers of children around the town of Lyme, Connecticut, were ...

What is mad cow disease? Mad cow disease is the common name for a very rare and deadly brain disease. The scientific name is bovine spongiform encephalopathy (BSE). It’s spread by eating beef produ...

What is mastitis? Mastitis is an inflammation of the breast. It is usually caused by an infection. It often happens while a woman is breastfeeding, especially during the first 6-12 weeks. Having ma...

What is mastocytosis? Mastocytosis is the abnormal growth of mast cells in the body. Mast cells are part of the immune system, which helps protect your body against infection. The most common form ...

The Centers for Disease Control and Prevention (CDC) is urging parents and travelers to be aware of a rise in measles cases. This highly contagious disease can spread quickly, but understanding mea...

What is menopause? Menopause is when your menstrual periods permanently stop (12 months in a row without a period) and you can no longer become pregnant. It is normal and occurs as you age. Menopau...

What is microscopic hematuria? Microscopic hematuria is blood in the urine. “Microscopic” means something is so small that it can only be seen through a special tool called a microscope. So, if you...