Fitness basics
Learning Center
HER2-positive breast cancer: What is it?
HER2-positive breast cancer tends to be more aggressive than other types of breast cancer. Treatments that target HER2 are very effective.
Bladder infection in men
Although women are more likely to get bladder infections, men can get them, too. Learn about signs and symptoms and what could put you at risk.
Mononucleosis: Can it recur?
Mono can return in some rare cases. Learn why that happens.
Bacterial vs. viral infections: How do they differ?
Understand the differences between bacterial and viral infections.
Male masturbation: Does frequency affect male fertility?
Male masturbation has little effect on sperm count or quality.
Measles vaccine: Can I get the measles if I've already been vaccinated?
Is it possible to get measles from someone else if you've been vaccinated?
Poppy seed tea: Beneficial or dangerous?
Poppy seed tea may be used as a natural pain reliever. The key is the opioids in the seed coating, which may be dangerous.
Clinical depression: What does that mean?
The term "clinical depression" means severe, persistent depression. It's also called major depression or major depressive disorder.
Reactive hypoglycemia: What can I do?
Reactive hypoglycemia is low blood sugar that happens after eating.
Cigar smoking: Safer than cigarette smoking?
Despite what you might think, cigars aren't that different from cigarettes. Like cigarettes, cigars contain nicotine, tobacco and cancer-causing chemicals.
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