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Polycystic ovary syndrome (PCOS) is a common condition characterized by a hormonal imbalance resulting in irregular or absent menstrual periods, acne, and/or increased facial/body hair growth.

A peptic ulcer is an open sore in the lining of the stomach or the duodenum.

Pneumonia is an inflammation of the lungs caused by bacteria, viruses, or chemical irritants.

The oils of the poison ivy plants can cause an allergic reaction in nearly 85 percent of the population.

Poliomyelitis (polio) is a highly contagious infectious disease that can result in paralysis.

A pollen allergy is a reaction to a fine powdery substance that come from flowering plants, including trees, grasses, and weeds.

Polycystic kidney disease (PKD) is a genetic disorder characterized by the growth of numerous cysts filled with fluid in the kidneys.

Polycythemia is a blood disorder occurring when there are too many red blood cells in the body.

Polydactyly is a condition in which a baby is born with one or more extra fingers.

Pulmonary hypertension (PH) is abnormally high blood pressure that occurs in the arteries of the lungs (the pulmonary arteries).