Diseases and Conditions

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

Filter By Alphabet
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

    Repeatedly losing a pregnancy is emotionally devastating and doesn’t always have a cause.

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

  • Rheumatic Fever

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

  • Rheumatoid Arthritis

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

  • 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,…