Learn more about this contagious viral illness that affects the nervous system. Severe disease can lead to paralysis, trouble breathing and sometimes death.
Disease
Polycystic kidney disease
Learn how treatments and lifestyle changes might help reduce kidney damage from this disease.
Disease
Polycystic ovary syndrome (PCOS)
Polycystic ovaries, hormone imbalance and irregular periods are telltale signs and symptoms of polycystic ovary syndrome. Find out about treatments.
Disease
Polycythemia vera
This slow-growing blood cancer mainly affects people over 60. Treatments and lifestyle changes may reduce complications and ease symptoms.
Disease
Polyhydramnios
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.