Diseases and Conditions

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

Reye syndrome is a rare but serious illness that can be harmful to the brain and liver. It often occurs…

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

Rheumatoid arthritis is a long-lasting inflammatory disorder. It causes swelling and pain in the lining of your joints. Doctors aren’t…

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. It used to be more common and severe, but now is treatable. It can…

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) affects how your brain processes sensory information, such as things you see, hear, smell, taste, or…

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.

Shin splints describe a type of pain in your shinbone (tibia). They are often caused by overuse and heal within…