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Diseases and Medical Conditions P-R provides down-to-earth, comprehensive definitions of hundreds of ailments and illnesses beginning with the letters P-R. Each listing identifies causes, incidence and risk factors, notes symptoms, outlines tests and discusses treatments and support groups where applicable.
Featured Article: Peripheral Artery Disease And Intermittent Claudication In-Depth
Peripheral artery disease and intermittent claudication occur when plaque clogs arteries in the extremities. Learn more about peripheral artery disease. See more »
Retinitis Pigmentosa
Retinitis pigmentosa is progressive damage to the retina impairing night and peripheral vision. Learn about retinitis pigmentosa causes, symptoms, treatment and prevention.
See more »Retinoblastoma
Retinoblastoma is a malignant tumor of the retina. Learn about retinoblastoma causes, symptoms, treatment and prevention.
See more »Retinopathy Of Prematurity
Retinopathy of prematurity (ROP) is abnormal development of retinal blood vessels in a premature child. Learn about ROP causes, symptoms, treatment and prevention.
See more »Retrocalcaneal Bursitis
Retrocalcaneal bursitis is inflammation of the bursa at the back of the heel bone. Learn about retrocalcaneal bursitis causes, symptoms, treatment and prevention.
See more »Retrograde Ejaculation
Retrograde ejaculation is when semen enters the bladder instead of the urethra during ejaculation. Learn about retrograde ejaculation causes, symptoms, treatment and prevention.
See more »Retroperitoneal Fibrosis
Retroperitoneal fibrosis is when a fibrous abdominal mass blocks the ureters. Learn about retroperitoneal fibrosis causes, symptoms, treatment and prevention.
See more »Retroperitoneal Inflammation
Retroperitoneal inflammation is an inflammation in the retroperitoneal space. Learn about retroperitoneal inflammation causes, symptoms, treatment and prevention.
See more »Retropharyngeal Abscess
Retropharyngeal abscess is a collection of puss in the tissues in the back of the throat. Learn about retropharyngeal abscess causes, symptoms, treatment and prevention.
See more »Retrosternal Thyroid
Retrosternal thyroid is an abnormal thyroid gland location below the sternum. Learn about retrosternal thyroid causes, symptoms, treatment and prevention.
See more »Retroversion Of The Uterus
Retroversion of the uterus is a normal variation in which the uterus is tipped backward instead of forward. Learn about retroversion of the uterus causes, symptoms, treatment and prevention.
See more »Rett Syndrome
Rett syndrome is a nervous system disorder that causes regression in development. Learn about Rett syndrome causes, symptoms, treatment and prevention.
See more »Reye Syndrome
Reye's syndrome refers to brain and liver damge that occurs for no known reason. Learn about Reye’s syndrome causes, symptoms, treatment and prevention.
See more »Rh Incompatibility
Rh incompatibility is the complications caused by different blood types in the mother and fetus. Learn about Rh incompatibility causes, symptoms, treatment and prevention.
See more »Rhabdomyolysis
Rhabdomyolysis is when muscle fiber break down releases harmful contents into the bloodstream. Learn about rhabdomyolosis causes, symptoms, treatment and prevention.
See more »Rhabdomyosarcoma
Rhabdomyosarcoma is a malignant tumor found in children. Learn about rhabdomyosarcoma causes, symptoms, treatment and prevention.
See more »Rheumatic Fever
Rheumatic fever is an inflammatory disease affecting the heart, joints, skin and brain often after strep throat. Learn about rheumatic fever causes, symptoms, tests, treatment and prevention.
See more »Rheumatoid Arthritis
Rheumatoid arthritis (RA), a chronic disease, inflames joints, tissue and organs. Learn about RA causes, symptoms, treatment and prevention.
See more »Rheumatoid Lung Disease
Rheumatoid lung disease is a lung disease associated with rheumatoid arthritis. Learn about rheumatoid lung disease causes, symptoms, treatment and prevention.
See more »Rheumatoid-collagen Disease
Rheumatoid-collagen disease is any disorder of the connective tissue with rheumatic symptoms. Learn about rheumatoid-collagen disease causes, symptoms, treatment and prevention.
See more »Rhinophyma
Rhinophyma is a large, bulbous appearance of the nose. Learn about rhinophyma causes, symptoms, treatment and prevention.
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