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Primary immunodeficiency
Frequent infections could mean you have an immune system disorder. The conditions in this category are usually caused by genetic changes.
Primary biliary cholangitis
Primary biliary cholangitis is a type of liver disease that damages the bile ducts. Early recognition and treatment may help prevent complications.
Premature birth
Here's what you need to know about caring for a premature baby and the possible health problems of a preterm birth.
Porphyria
This group of disorders results from a buildup of natural chemicals in the body that affect the nervous system and skin. Learn how to avoid symptom triggers.
Polyhydramnios
Learn about the symptoms, causes and treatment for this condition, in which too much amniotic fluid builds up during pregnancy.
Pheochromocytoma
Find out more about the symptoms, causes and treatment of this rare adrenal gland tumor, which usually is not cancer.
Peritonitis
Learn about the causes, symptoms and treatment of peritonitis.
Peripheral neuropathy
Learn what may cause the prickling, tingling or numb sensations of nerve damage and how to prevent and treat this painful disorder.
Peptic ulcer
Feeling a dull or burning pain in your stomach? It could be a peptic ulcer — a common, treatable digestive condition. Find out more.
Parkinson's disease
There's no cure for this progressive movement disorder, but treatments can help significantly improve your symptoms.
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