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Prostate Cancer
Prostate cancer is a cancer that begins in cells of the prostate gland. The prostate is a small gland located below the…
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Prostatitis
Prostatitis is inflammation of the prostate, a gland below the bladder that surrounds part of the urethra. It may be caused by…
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Psoriatic Arthritis
Psoriatic arthritis is a long-term inflammatory condition in which the immune system mistakenly attacks healthy tissues, causing pain, swelling, and stiffness in…
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Pubic Lice
Pubic lice are tiny parasitic insects that usually live in coarse body hair, especially pubic hair. Sexual contact is a common way…
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Pulmonary Disease
Pulmonary disease is a broad term for conditions that affect the lungs, airways, or blood vessels within the lungs. Some conditions are…
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Pulmonary Embolism
A pulmonary embolism is a blockage in a blood vessel in the lungs, usually caused by a blood clot that formed in…
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Pulmonary Hypertension
Pulmonary hypertension is high blood pressure in the blood vessels that carry blood between the heart and lungs. This increased pulmonary artery…
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Pulpitis
Pulpitis is inflammation of the pulp, the soft, living tissue at the center of a tooth that contains nerves and blood vessels.…
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Pure Red Cell Aplasia
Pure Red Cell Aplasia is a rare disorder in which the bone marrow makes too few or no red blood cell precursors.…
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Pyelonephritis
Pyelonephritis is a kidney infection that causes inflammation in one or both kidneys. It often begins as a bladder infection that travels…
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Pyloric Stenosis
Pyloric stenosis is a condition in which the muscle around the pyloric sphincter becomes unusually thick. This pyloric narrowing reduces the opening…
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Q Fever
Q fever is an infection caused by the bacterium Coxiella burnetii. People can become infected after exposure to infected cattle, sheep, goats,…
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Radicular Cyst
A radicular cyst is a fluid-filled inflammatory sac that usually develops at the tip of a tooth root after a long-standing infection…
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Ranula
A ranula is a fluid-filled swelling caused by saliva collecting in the floor of the mouth, usually beneath the tongue. It often…
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Rat-Bite Fever
Rat-bite fever is a bacterial infection linked to infected rats and other rodents. It can follow a rat bite, scratch, contact with…
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Rectal Cancer
Rectal cancer is abnormal cell growth that begins in the rectum, the final part of the large intestine before the anus. It…
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Renal Oncocytoma
Renal oncocytoma is a growth that develops from cells in the kidney and is generally benign, meaning it is not cancer. An…
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Restless Legs Syndrome
Restless Legs Syndrome (RLS) is a neurological sleep-related movement disorder that causes an uncomfortable urge to move the legs. Symptoms commonly begin…
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Rheumatoid Arthritis
Rheumatoid arthritis is a chronic autoimmune disease and type of inflammatory arthritis that causes joint pain, swelling and stiffness. The immune system…
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Right Ventricular Failure
Right ventricular failure happens when the right ventricle cannot pump blood effectively from the body to the lungs. This reduced pumping can…
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Rocky Mountain Spotted Fever
Rocky Mountain spotted fever is a bacterial infection caused by Rickettsia rickettsii and spread mainly through the bite of an infected tick.…
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Rotator Cuff Tear
A rotator cuff tear is a split or break in one or more of the tendons that connect the shoulder muscles to…
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Rotavirus Infection
Rotavirus infection is a contagious viral illness that commonly causes vomiting and watery diarrhea. Infants and young children are affected most often,…
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Sarcoidosis
Sarcoidosis is an inflammatory condition in which clusters of immune cells, called granulomas, form in one or more organs. The lungs and…
