Learn about the symptoms, causes and treatment for this condition, in which too much amniotic fluid builds up during pregnancy.
Disease
Polymorphous light eruption
Learn more about the symptoms and treatments for this sun-induced skin rash that usually appears in spring or summer, and also after using tanning beds.
Disease
Polymyalgia rheumatica
Older adults who get sudden muscle pain and stiffness, mainly in the shoulders, might have this condition.
Disease
Polymyositis
The muscle weakness from this condition can make it hard to climb stairs or reach up. Breathing and swallowing also can be affected.
Disease
Popliteal artery aneurysm
Learn more about this lower extremity aneurysm that occurs in the wall of an artery located behind the knee.
Disease
Popliteal artery entrapment syndrome
Calf pain cramping your style during a workout? Know the symptoms of popliteal artery entrapment syndrome.
Disease
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.
Disease
Post-polio syndrome
This syndrome causes a number of potentially serious symptoms that appear decades after the polio virus.
Disease
Post-traumatic stress disorder (PTSD)
This mental health condition, which is caused by being part of or witnessing a terrifying event, leads to symptoms that include flashbacks, nightmares and severe anxiety.
Disease
Post-vasectomy pain syndrome
Learn about post-vasectomy pain syndrome (PVPS) — How it happens after a vasectomy, tests to diagnose it and treatment options.
Disease
Posterior cortical atrophy
This rare neurological syndrome that's often caused by Alzheimer's disease affects vision and coordination.
Disease
Posterior vaginal prolapse (rectocele)
In this pelvic floor disorder, the rectum presses against weakened tissues and bulges into the vagina. Learn about the symptoms and treatments.