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A parasite is an animal or plant that lives in or on another animal or plant (called the host). A parasite gets nourishment from

Paraphimosis is a condition in which the skin that normally covers the penis—the foreskin—is tight when it is pulled back and then

Paralysis is a loss of nerve function or muscle power resulting in an inability to move. When nerve cells in the brain or other

A hernia is tissue from inside the abdomen that bulges out through a weak spot in the muscles of the abdominal wall. In a

Paracentesis is a procedure in which a needle is inserted through the abdominal wall to remove fluid that has built up in the

A Pap test is a test that looks for changes in the cells of the cervix. During the test, your doctor collects a small sample of

A panic attack is a sudden feeling of extreme anxiety. Symptoms include feelings of dying or losing control of oneself, rapid

Pancreatitis is inflammation of the pancreas, an organ in your belly that makes insulin and enzymes that help you digest food

The pancreas is an organ in the upper abdomen, behind the stomach and close to the spine, that produces substances (digestive

Heart palpitations are an uncomfortable awareness of the heart beating rapidly or irregularly. Palpitations can be caused by many