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Learning Center
Sulfa allergy: Which medications should I avoid?
Sulfa allergy: A Mayo Clinic expert discusses which medications are likely to cause problems.
Stress and hair loss: Are they related?
Learn how stress and hair loss can be related.
Stool color: When to worry
Stool color is usually a result of diet and is only rarely a concern.
Stomach flu: How long am I contagious?
Depending on which virus causes your stomach illness, you can be contagious from a few days to two weeks or more.
Statins: Do they cause ALS?
Statins can cause muscle injury in some people. But can they also trigger ALS?
Sperm: How long do they live after ejaculation?
After ejaculation, the life span of sperm depends on the circumstances.
Spastic colon: What does it mean?
This term is sometimes used to refer to irritable bowel syndrome (IBS) — but how accurate is it?
Soy: Does it worsen hypothyroidism?
For most people with hypothyroidism, it's okay to have some soy. But the timing makes a difference.
Soy: Does it reduce cholesterol?
Soy alone doesn't lower cholesterol enough to make a big difference. But eating soy can still be healthy.
Small cell, large cell cancer: What this means
Cancer cells are classified by how they look under a microscope. Learn common terms used to describe cancer cells.
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