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Diseases and Conditions

Find doctor-approved information about symptoms, causes, diagnosis, treatment and prevention of common diseases and conditions.

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  • A photo of female legs isolated on a white background

    Restless Leg Syndrome

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

  • Bottle of white pills spilled out onto a table

    Reye Syndrome

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

  • Young boy having his throat swabbed

    Rheumatic Fever

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

  • Close up of rheumatism / arthritis medical examination

    Rheumatoid Arthritis

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

  • Baby feet on white background with blue blanket

    Rickets

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

  • Ringworm on a man’s wrist

    Ringworm

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

  • Young Woman with Perfect Skin and Skin Problem. Unhealthy and Healthy Skin After Treatment.

    Rosacea

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

  • Stethoscope wth rotavirus sign

    Rotavirus

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

  • Lung Illustration

    Sarcoidosis

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

  • Young boy with skin rash covering his chest and arms

    Scarlet Fever

    Scarlet fever is a bacterial infection. It used to be more common and severe, but now is treatable. It can…

  • Schizophrenia

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

  • Hand Massage to help pain in the finger joints.

    Scleroderma

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

  • Pediatrician examining little girl with back problems.

    Scoliosis

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

  • sad-looking woman in a coat and scarf stands under an umbrella in the rain

    Seasonal Affective Disorder

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

  • Seborrheic Dermatitis

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

  • Preschool boy playing on a tire swing, leaning back as far as he can

    Sensory Processing Disorder (SPD)

    Sensory processing disorder (SPD) affects how your brain processes sensory information, such as things you see, hear, smell, taste, or…

  • Sever's Disease

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

  • Sexual Dysfunction in Men and Women

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

  • Sexually Transmitted Infections (STIs)

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

  • Woman runner holding shin in pain

    Shin Splints

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

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