Stress basics
Learning Center
Scorpion sting
Scorpion stings are painful but rarely life-threatening. Young children and older adults are most at risk of serious complications.
Salt craving: A symptom of Addison's disease?
Constantly craving salt could signal a medical condition, such as Addison's disease.
Ringworm (scalp)
Learn more on causes, symptoms, treatments of this easily spread, itchy fungal skin infection and how to prevent it.
Rheumatoid arthritis: Does pregnancy affect symptoms?
Learn how pregnancy can affect rheumatoid arthritis symptoms.
Rett syndrome
This rare genetic disorder affects the way the brain develops, causing a progressive inability to use muscles for eye and body movements and language.
Retrograde ejaculation
Learn about the symptoms and treatment options for this condition that can cause male infertility.
Retractile testicle
Find out about this condition that allows the testicle to move between the scrotum and groin.
Recurrent prostate infection: What are the treatment options?
These infections that keep coming back can be hard to treat. Here's what to know.
Rectal bleeding
Blood in your stool, on the toilet paper or in the toilet bowl can have various causes. See your doctor if it lasts more than a day or two.
Pulse pressure: An indicator of heart health?
Pulse pressure may be a strong predictor of heart problems, especially for older adults.
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