Diseases and Conditions

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

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

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

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

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

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

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

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

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

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

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

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

Acid reflux occurs when acid from your stomach backs up into your throat. It can be caused by many factors…

Only 1% of women experience multiple miscarriages. They can be caused by health conditions including chromosome defects and uterus…

Reactive arthritis occurs when your immune system reacts to an infection somewhere else in your body. It can affect your…

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

What is pyloric stenosis? Pyloric stenosis is a medical condition. It is a narrowing of the opening between the stomach and the small intestine. That space is called the pylorus. It often occurs in babies younger than 6 months. It is more common in

Pulmonary hypertension is an increase in pressure in the blood vessels that carry blood to the lungs. It is a…

Psoriasis is a common chronic skin condition. It causes a rash that is raised with red marks and flaky white…

Pseudogout is a type of arthritis that causes painful swelling in one or more of your joints. It can lead…