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Circumcision is a surgery to remove the foreskin, a fold of skin that covers and protects the rounded tip of the penis. If it's

Lice are tiny insects that live or feed on the human body. They can't jump or fly, but they can spread easily from one person to

Tonsillitis is an infection or inflammation of the tonsils. The tonsils are areas of tissue on either side of your throat, above

A free radical is an atom or molecule with at least one unpaired electron, making it especially reactive to other atoms or groups

Complementary medicine is a nonstandard therapy that some people use in addition to their doctor's standard care. (The word

Patellar tracking disorder is an imbalance in the knee area that causes the kneecap (patella) to shift or tilt out of place as the

Provides step-by-step instructions and photos for doing easy and then more intense exercises for patellar tracking disorder.

Accommodation is the ability of the lens of the eye to change shape, allowing for a change in focus from far to near. The lens

Photorefractive keratectomy (PRK) and laser epithelial keratomileusis (LASEK) for farsightedness use a laser to reshape the cornea

Laser in-situ keratomileusis (LASIK) is the preferred procedure for correcting farsightedness (hyperopia). It changes the shape of