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Schizophrenia
Schizophrenia is a mental illness that interferes with the way you think, feel, and behave.
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Scarlet Fever
Scarlet fever is a bacterial infection. It used to be more common and severe, but now is treatable. It can…
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Sarcoidosis
Sarcoidosis is a disease in which immune cells form small lumps, called granulomas, in your organs, often in the…
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Rotavirus
Rotavirus is a highly contagious infection commonly affecting babies and young children. A rotavirus vaccine offers some, but not full,…
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Rosacea
Rosacea is a common skin condition that occurs on the face. It causes redness and small bumps that are similar…
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Ringworm
Ringworm is a skin infection that makes a rash shaped like a ring. The rash can occur different places on…
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Rickets
Rickets is a rare disorder that affects children’s bones, causing them to soften and break easily.
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Rheumatoid Arthritis
Rheumatoid arthritis is a long-lasting inflammatory disorder. It causes swelling and pain in the lining of your joints. Doctors aren’t…
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Rheumatic Fever
Rheumatic fever is a rare disease. It usually doesn’t happen in the United States. It’s tied to the bacteria that…
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Restless Leg Syndrome
Restless legs syndrome is a condition in which your legs feel very uncomfortable when you’re sitting or lying down. It…
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Respiratory Syncytial Virus (RSV)
Respiratory syncytial virus (RSV) is a common virus that makes it hard to breathe. RSV is common in children under…
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Repeated Infections in Children
Learn why your child may get several infections while he or she is still young.
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Reflux/Acid Reflux (GERD)
Acid reflux occurs when acid from your stomach backs up into your throat. It can be caused by many factors…
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Recurrent Pregnancy Loss
Only 1% of women experience multiple miscarriages. They can be caused by health conditions including chromosome defects and uterus…
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Reactive Arthritis
Reactive arthritis occurs when your immune system reacts to an infection somewhere else in your body. It can affect your…
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Raynaud's Disease
Raynaud’s disease is a rare condition that narrows your blood vessels. It causes your fingers or toes to turn color…
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Pyloric Stenosis
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
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Pulmonary Hypertension
Pulmonary hypertension is an increase in pressure in the blood vessels that carry blood to the lungs. It is a…
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Psoriasis
Psoriasis is a common chronic skin condition. It causes a rash that is raised with red marks and flaky white…
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Pseudogout
Pseudogout is a type of arthritis that causes painful swelling in one or more of your joints. It can lead…