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Peyronie's disease is caused by scar tissue in the penis, which makes the penis curve during an erection. This curving may cause

Petechiae (say "pet-TEA-key-eye") are tiny, flat red or purple spots in the skin or the lining of the mouth caused by abnormal

Autism spectrum disorder (ASD) is a developmental disorder. It affects a person's behavior and makes communication and social

Phosphorus is a mineral the body needs to function and for the cells to work well. Phosphorous is found in all parts of the body

A peak flow meter is an inexpensive, pocket-sized device that measures peak expiratory flow (PEF), or how much air a person can

The peritoneum lines the abdominal cavity, supporting the organs in the abdomen and helping to protect them from infection. The

Peritoneal fluid is naturally produced in the abdominal (belly) cavity. It lubricates surfaces and prevents friction between

Peripheral arterial disease (PAD) is a narrowing or blockage of arteries that causes poor blood flow to your legs or arms. The

The peripheral nervous system includes the nerves leading from the brain and spinal cord to the rest of the body. It is made up of

Periodontitis is a serious gum disease in which the tissues and bones that support your teeth are damaged by the bacteria in