Conditions & Treatments

What are plugged milk ducts? A plugged duct feels like a tender lump in the breast. Some mothers seem to be more prone to developing them. Usually they happen when a mother goes too long without emptying her breasts. Or, if insufficient milk is removed ...

What is pneumonia? Pneumonia is an inflammation of the lungs caused by bacteria, viruses, or chemical irritants. It is a serious infection or inflammation in which the air sacs fill with pus and other liquid. Lobar pneumonia. This affects one or more sections (lobes) of ...

What is a pneumothorax in children? A pneumothorax is an air leak in the lungs. It’s when air from the lungs leaks into the chest area. The leak may start suddenly or may develop slowly. It often occurs in the first 24 to 36 hours ...

Poison ivy rash is an allergic reaction to poison ivy. Poison ivy is very common plant in the U.S. It is similar to two other plants called poison oak and poison sumac. The plants cause allergic dermatitis. ...

Poland syndrome is a complex genetic deformity in which the chest muscle is underdeveloped or absent. ...

Poliomyelitis (polio) is a very contagious disease caused by a virus. Most children who are infected with polio have no symptoms. ...

Pollakiuria means frequent, abnormal urination during the day. ...

Polycystic kidney disease (PKD) is a rare genetic disorder. It causes numerous cysts filled with fluid to grow in the kidneys. PKD cysts can reduce kidney function, leading to kidney failure. PKD is the 4th leading cause of kidney failure. People with PKD can also ...

Polycystic ovary syndrome (PCOS) is a set of symptoms caused by a problem with a woman’s hormones. It affects the small organs that store a woman’s eggs (ovaries). But it can also affect the rest of the body. ...

Polycythemia vera is a serious, but very rare blood disorder in children. With polycythemia vera, the bone marrow makes too many red blood cells. ...