Nutrition basics
Learning Center
Taurine in energy drinks: What is it?
Energy drink ingredients can cause concern for some who consume these beverages.
Swimmer's ear
The moist environment from water remaining in your ear after swimming or bathing can lead to this infection in the outer ear canal.
Sulfa allergy: Which medications should I avoid?
Sulfa allergy: A Mayo Clinic expert discusses which medications are likely to cause problems.
Stool color: When to worry
Stool color is usually a result of diet and is only rarely a concern.
Stage 4 prostate cancer
Find out about diagnosis and treatment of this cancer that has spread to the lymph nodes or other parts of the body.
Spermatocele
Learn more about this noncancerous testicular disorder that may require surgery if it's causing discomfort. But, the condition often needs no treatment.
Sodium: How to tame your salt habit
Find out which foods have lots of this mineral and get tips on how to cut back.
Sleep deprivation: A cause of high blood pressure?
Too little sleep affects not only energy levels but also heart health.
Sinus infection and toothache: Any connection?
Sometimes the cause of a toothache isn't a tooth problem, but a sinus problem.
Sex headaches
Learn about the causes and treatment of this type of headache.
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