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Repetitive-stress injuries (RSIs) can be painful and debilitating, causing damage to tendons, ligaments, nerves, and muscles over time. Also called repetitive motion syndromes, RSIs can affect almost any part of the body. Test your knowledge of RSIs by taking this multiple-choice quiz.

Ductal carcinoma is the most common type of breast cancer. It starts in the ducts of the breast. Cancer can start in other parts of the breast, too. Learn more about symptoms, diagnosis, and treatments.

Gallbladder cancer starts in the cells that form the gallbladder. Learn more about symptoms, diagnosis, and treatments.

Tongue-tie (ankyloglossia) is a problem with the tongue that is present from birth. It causes speech and eating problems in some children.

The injury may be to a primary tooth or a permanent tooth. A tooth can be cracked, chipped, or totally detached from its socket.

Mumps is a very contagious viral illness that infects the pair of salivary glands in front of the ears. Cases of mumps in the U.S. happen much less often since the mumps vaccine has been used.

Carbon monoxide poisoning is an illness that occurs from breathing in carbon monoxide (CO) gas. It's a medical emergency and needs treatment right away.

Nonmelanoma is the most common type of skin cancer. It is successfully treated if found early. Read on to learn more.

Detailed information on skin cancer, including anatomy of the skin, skin cancer facts, skin cancer causes, skin cancer types, cutaneous t-cell lymphoma, actinic keratosis, skin cancer treatment, sun-damaged skin, skin cancer prevention, and sunscreen.