Fitness basics
Learning Center
Ringworm (body)
Learn more on causes, symptoms, treatments of this easily spread fungal skin infection that itches and is related to athlete's foot.
Rickets
Learn what can cause this bone-softening disease in children and how supplements may prevent or treat the condition.
Rheumatic fever
Learn about this complication of strep throat and scarlet fever and what you can do to prevent it.
Reye's syndrome
Learn about the causes and treatment of this rare but serious condition causing swelling in the liver and brain.
Retinoblastoma
Learn about the symptoms, causes and treatments for this eye cancer that occurs in young children.
Respiratory syncytial virus (RSV)
This common illness affects the lungs. It can seem like a cold, but may be severe, especially in children. Know the symptoms and treatment.
Recurrent breast cancer
Learn about symptoms that alert doctors to a breast cancer recurrence and strategies for treating cancer that comes back after initial treatment.
Rectovaginal fistula
This open tunnel connects the rectum and vagina, allowing gas or stool to pass into the vagina. Learn about rectovaginal fistula treatment and self-care.
Reactive attachment disorder
Reactive attachment disorder is when an infant or young child doesn't establish healthy attachments with parents or caregivers due to neglect.
Pulmonary valve stenosis
When the valve between the heart and lungs is narrowed, blood flow slows. Know the symptoms of this type of valve disease and how it's treated.
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