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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…
Prostatitis
Prostatitis is inflammation of the prostate, a gland below the bladder that surrounds part of the urethra. It may be caused by…
Pulmonary Disease
Pulmonary disease is a broad term for conditions that affect the lungs, airways, or blood vessels within the lungs. Some conditions are…
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…
Rheumatoid Arthritis
Rheumatoid arthritis is a chronic autoimmune disease and type of inflammatory arthritis that causes joint pain, swelling and stiffness. The immune system…
Sarcoidosis
Sarcoidosis is an inflammatory condition in which clusters of immune cells, called granulomas, form in one or more organs. The lungs and…
Sarcoma Cancer
Sarcoma cancer is a group of cancers that begins in connective tissues, such as muscle, fat, blood vessels, nerves, and tendons, or…
Scleroderma
Scleroderma is an autoimmune connective tissue disease that causes the body to make too much collagen. This buildup can make the skin…
Severe Congenital Neutropenia
Severe congenital neutropenia is a group of rare, usually genetic disorders that are present from birth. The body has persistently very low…
Shwachman-Diamond Syndrome
Shwachman-Diamond syndrome is a rare inherited disorder that usually begins in infancy or early childhood. It commonly affects the bone marrow, pancreas,…
Sickle Cell
Sickle cell disease is an inherited blood disorder that affects hemoglobin, the protein red blood cells use to carry oxygen. Abnormal hemoglobin…
Sjogren Syndrome
Sjogren syndrome is an autoimmune disease in which the immune system mistakenly attacks the body's moisture-producing glands. It commonly reduces tear production,…
Skin Cancer
Skin cancer is the uncontrolled growth of abnormal cells in the skin. The main types are basal cell carcinoma, squamous cell carcinoma,…
Sleep Apnea
Sleep apnea is a sleep disorder in which breathing repeatedly stops or becomes too shallow during sleep. These interruptions may last long…
Systemic Lupus Erythematosus
Systemic lupus erythematosus, often called lupus, is a chronic autoimmune disease in which the immune system mistakenly attacks healthy tissues. It can…
Tar Syndrome
TAR syndrome stands for thrombocytopenia-absent radius syndrome, a rare genetic condition. People with TAR typically have absent or severely underdeveloped radius bones…
Testicular Cancer
Testicular cancer is a cancer that begins in one or both testicles, the organs that make sperm and testosterone. It most often…
Tetanus
Tetanus is a serious disease caused by a toxin made by Clostridium tetani bacteria. The bacteria usually enter the body through broken…
Thalassemia
Thalassemia is an inherited blood disorder in which the body makes less hemoglobin than it needs. Hemoglobin is the protein in red…
Thrombocytopenia
Thrombocytopenia is the medical term for a platelet count that is lower than usual. Platelets are small blood cells that gather at…
Thyroid Cancer
Thyroid cancer begins when cells in the thyroid grow and divide abnormally. The thyroid is a small, butterfly-shaped gland at the front…
Trichomoniasis
Trichomoniasis is a curable sexually transmitted infection caused by the parasite Trichomonas vaginalis. It can affect people of any sex and is…
Trichotillomania
Trichotillomania is a mental health condition that causes repeated urges to pull out hair from the scalp, eyebrows, eyelashes, or other areas.…
Trigeminal Neuralgia
Trigeminal neuralgia is a condition that causes sudden, severe facial pain, often described as an electric shock. It happens when the trigeminal…



