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Post-thrombotic syndrome (also called postphlebitic syndrome) is a complication of a blood clot that forms in a deep vein. Post

Postnasal drip occurs when mucus from the nasal passages and sinuses drains into the throat. If the mucus becomes thick, postnasal

Post-traumatic stress disorder, or PTSD, is a strong and lasting emotional reaction to a very disturbing event, such as war

Portal hypertension is high pressure in the veins that filter blood from the intestines through the liver (portal system of the

Polyps can grow on the inner surface of the nose or throat or in organs such as the large intestine (colon) or uterus. Most polyps

Polymyalgia rheumatica (PMR) is a condition that causes inflammation of the joints. This causes pain and stiffness, most often in

Polycythemia vera is an abnormal increase in blood cells, primarily red blood cells (polycythemia) but also white blood cells and

Polycythemia, also called erythrocytosis, is an abnormal increase in the number of red blood cells produced by the bone marrow

Polycystic ovary syndrome (PCOS) is a hormone imbalance that can affect ovulation. It can cause problems with your menstrual

Polyarticular juvenile idiopathic arthritis (JIA), also known as polyarthritis, affects 5 or more joints during the first 6 months