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Pneumonia is a lung infection that can make you very sick. You may cough, run a fever, and have a hard time breathing. It can

Pica is a condition in which a person craves substances that are not food, such as clay, dirt, ice, or flecks of old paint. Pica

Pleurisy is swelling (inflammation) of the thin layers of tissue (pleura) covering the lungs and the chest wall. In young, healthy

A platelet is the smallest type of blood cell. Platelets are the body's first defense against bleeding, helping the blood to clot

Plaque is a buildup of cholesterol, white blood cells, calcium, and other substances in the walls of arteries. Over time, plaque

Plaque is a clear, sticky substance made in the mouth. It clings to the teeth and gums. Plaque has bacteria that make acids and

Plantar warts are noncancerous (benign) skin growths. They develop on the bottom of the foot and usually appear as areas of thick

Plantar fasciitis (say "PLAN-ter fash-ee-EYE-tus") is inflammation along the bottom of the foot and heel. It happens when the flat

Placenta previa is a placenta that covers all or part of the lower part of the uterus (cervix). During labor and delivery

Placental abruption is the separation of the placenta from the uterus before a baby is delivered. It usually happens in the third