Fitness basics
Learning Center
Nail ridges: Cause for concern?
Vertical nail ridges are common and often become more prominent with age.
Multivitamins: Do young children need them?
Multivitamins: Are they good insurance for young children?
Mononucleosis: Can it recur?
Mono can return in some rare cases. Learn why that happens.
Monkeypox: What is it and how can it be prevented?
Find out more about the rare mpox, or monkeypox, viral infection, the possible symptoms in humans, treatment options and how to prevent getting or spreading the virus.
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?
Male masturbation: Does frequency affect male fertility?
Male masturbation has little effect on sperm count or quality.
Macrocytosis: What causes it?
Enlarged red blood cells (macrocytosis) can be due to many factors.
Lung nodules: Can they be cancerous?
Lung nodules are common. Most aren't cancer. Find out what tests might be recommended if you have a lung nodule.
Low blood sodium in older adults: A concern?
For older adults, low blood sodium, known as hyponatremia, can cause death if left untreated.
Loss of sex drive in men: Natural with aging?
Age-related loss of sex drive is normal, but sometimes an underlying condition is at play.
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