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Polio (poliomyelitis) is a viral illness that damages nerves that control muscles, resulting in muscle weakness. In severe

Potassium is a mineral in the body that helps maintain fluid balance, nerve function, and muscle contraction, as well as the

Painful menstrual cramps (dysmenorrhea) can occur during or just before your period. The cramping can involve your lower belly

Puberty is the time of life when people develop physically and sexually so that they can have children. It is the time when male

The pupil is the black area in the center of the iris, the colored part of the eye. The iris controls the size of the pupil in

Pulmonary edema is the buildup of fluid in the lungs, usually resulting from the heart's inability to pump blood through the body

The pulp is the center (core) of a tooth. It contains nerves and blood vessels and helps fight infection in the tooth. The pulp

Pulmonary fibrosis is a condition in which scarring occurs in the lungs. It can be caused by an infection (such as tuberculosis or

Psoriatic arthritis is a form of arthritis that sometimes develops in people who have a skin condition called psoriasis. It causes

Psoriasis (say "suh-RY-uh-sus") is a long-term (chronic) skin problem that causes skin cells to grow too quickly and form thick