Diseases and Conditions

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

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All conditions that start with the letter R
  • Raynaud's Disease

    Raynaud’s disease is a rare condition that narrows your blood vessels. It causes your fingers or toes to turn color…

  • Reactive Arthritis

    Learn about reactive arthritis and how it is treated.

  • Recurrent Pregnancy Loss

    Recurrent pregnancy loss is when you have 2 or more miscarriages, or pregnancies that end in the first 20 weeks…

  • Reflux/Acid Reflux (GERD)

    Reflux is a medical condition that happens when the acid in your stomach backs up to your throat. It causes…

  • Repeated Infections in Children

    Learn why your child may get several infections while he or she is still young.

  • Respiratory Syncytial Virus (RSV)

    Respiratory syncytial virus (RSV) is a common virus that affects your lungs and breathing. People of all ages can get…

  • Restless Leg Syndrome

    Restless leg syndrome (also called RLS) is a condition in which your legs feel very uncomfortable when you are sitting…

  • Reye Syndrome

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

  • Rheumatic Fever

    Rheumatic fever is a disease that can develop from strep throat. It is not common in the U.S. and mostly…

  • Rheumatoid Arthritis

    Rheumatoid arthritis is an autoimmune condition that causes swelling and pain in the lining of joints.

  • Rickets

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

  • Ringworm

    Ringworm (tinea) is a common skin infection. The rash is ring-shaped and can occur on different parts of your body…

  • Rosacea

    Rosacea is a common skin condition that occurs on the face. It is marked by redness, which can be relieved…

  • Rotavirus

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