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Respiratory Syncytial Virus (RSV)
Respiratory syncytial virus (RSV) is a common virus that makes it hard to breathe. RSV is common in children under…
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Restless Leg Syndrome
Restless legs syndrome is a condition in which your legs feel very uncomfortable when you’re sitting or lying down. It…
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Reye’s Syndrome
Reye’s syndrome is a rare but serious illness common in children recovering from a virus and taking aspirin. It can…
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Rheumatic Fever
Rheumatic fever is a rare disease. It usually doesn’t happen in the United States. It’s tied to the bacteria that…
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Rheumatoid Arthritis
Rheumatoid arthritis (RA) is a chronic (lasting) inflammatory disorder. It causes swelling and pain in the lining of your…
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Rickets
Rickets is a rare disorder that affects children’s bones, causing them to soften and break easily.
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Ringworm
Ringworm is a skin infection that makes a rash shaped like a ring. The rash can occur different places on…
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Rosacea
Rosacea is a common skin condition that occurs on the face. It causes redness and small bumps that are similar…
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Rotavirus
Rotavirus is a highly contagious infection commonly affecting babies and young children. A rotavirus vaccine offers some, but not full,…
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Sarcoidosis
Sarcoidosis is a disease in which immune cells form small lumps, called granulomas, in your organs, often in the…
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Scarlet Fever
Scarlet fever is a bacterial infection that usually effects children between the ages of 5 and 15. It can be…
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Schizophrenia
Schizophrenia is a mental illness that interferes with the way you think, feel, and behave.
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Scleroderma
Scleroderma is a rare autoimmune disorder. There are 2 types of scleroderma. One type affects the skin. The other type…
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Scoliosis
Scoliosis is an abnormal curve of the spine (backbone). Normally, the spine is straight. With scoliosis, the spine is crooked…
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Seasonal Affective Disorder
Seasonal affective disorder (SAD) is a type of depression triggered by the seasons. It is likely related to the loss…
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Seborrheic Dermatitis
Learn about the causes of and treatment options for seborrheic dermatitis.
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Sensory Processing Disorder (SPD)
Sensory processing disorder (SPD) is a condition that affects how your brain processes sensory information (stimuli).
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Sever's Disease
Sever’s disease is a common heel injury that occurs in children. It is painful and caused by swelling of the…
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Sexual Dysfunction in Men and Women
Learn about the symptoms, causes and treatment of sexual dysfunction disorders.
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Sexually Transmitted Infections (STIs)
Learn about sexually transmitted infections and how you can prevent them.