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What is Reye’s syndrome? Reye’s syndrome is a rare but serious illness that can be harmful to the brain and the liver. It is most common in children, but anyone can get it. It is considered a two-p...

What is rheumatic fever? Rheumatic fever is a rare inflammatory disease. It mostly happens in areas that don’t have access to health care. It usually doesn’t happen in the United States. Children a...

What is rickets? Rickets is a rare disorder that affects the bones, causing them to soften and break easily. It is most common in children. What are the symptoms of rickets? Rickets has several mai...

What is RSV? Respiratory Syncytial Virus, or RSV, is a common virus that affects the lungs and breathing passages. The virus is common in children under 2; however, people of all ages can get it. O...

What is sarcoidosis? Sarcoidosis is a disease in which immune cells form small lumps, called granulomas, in your organs. Experts believe that inflammation causes these granulomas to form. The infla...

What is scleroderma? Scleroderma is a rare autoimmune disorder made up of a group of diseases. There are 2 types of scleroderma: localized and systemic. Localized scleroderma affects primarily the ...

What is seasonal affective disorder? Seasonal affective disorder (SAD) is a type of depression that is triggered by the seasons of the year. Symptoms usually begin in late fall or early winter. Peo...

What is sensory processing disorder? Sensory processing disorder (SPD) is a condition that affects how your brain processes sensory information (stimuli). Sensory information includes things you se...

What is postpartum preeclampsia? Postpartum preeclampsia is high blood pressure in a woman who has recently had a baby. It can happen as early as a few days afterwards, or up to several weeks after...

What is prediabetes? Prediabetes means your blood glucose (also called blood sugar) levels are higher than normal. When your blood glucose levels reach a certain level, you have diabetes. This is a...