Diseases and Conditions

Respiratory syncytial virus (RSV) is a common virus that makes it hard to breathe. RSV is common in children under…

Restless legs syndrome is a condition in which your legs feel very uncomfortable when you’re sitting or lying down. It…

Reye’s syndrome is a rare but serious illness common in children recovering from a virus and taking aspirin. It can…

Rheumatic fever is a rare disease. It usually doesn’t happen in the United States. It’s tied to the bacteria that…

Rheumatoid arthritis (RA) is a chronic (lasting) inflammatory disorder. It causes swelling and pain in the lining of your…

Rickets is a rare disorder that affects children’s bones, causing them to soften and break easily.

Ringworm is a skin infection that makes a rash shaped like a ring. The rash can occur different places on…

Rosacea is a common skin condition that occurs on the face. It causes redness and small bumps that are similar…

Rotavirus is a highly contagious infection commonly affecting babies and young children. A rotavirus vaccine offers some, but not full,…

Sarcoidosis is a disease in which immune cells form small lumps, called granulomas, in your organs, often in the…

Scarlet fever is a bacterial infection that usually effects children between the ages of 5 and 15. It can be…

Schizophrenia is a mental illness that interferes with the way you think, feel, and behave.

Scleroderma is a rare autoimmune disorder. There are 2 types of scleroderma. One type affects the skin. The other type…

Scoliosis is an abnormal curve of the spine (backbone). Normally, the spine is straight. With scoliosis, the spine is crooked…

Seasonal affective disorder (SAD) is a type of depression triggered by the seasons. It is likely related to the loss…

Learn about the causes of and treatment options for seborrheic dermatitis.

Sensory processing disorder (SPD) is a condition that affects how your brain processes sensory information (stimuli).

Sever’s disease is a common heel injury that occurs in children. It is painful and caused by swelling of the…

Learn about the symptoms, causes and treatment of sexual dysfunction disorders.

Learn about sexually transmitted infections and how you can prevent them.