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Learning Center
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?
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.
Mononucleosis: Can it recur?
Mono can return in some rare cases. Learn why that happens.
Multivitamins: Do young children need them?
Multivitamins: Are they good insurance for young children?
Nail ridges: Cause for concern?
Vertical nail ridges are common and often become more prominent with age.
Ocular migraine: When to seek help
Flashes of light, zigzagging patterns and temporary blindness — what does it all mean?
Ovulation signs: When is conception most likely?
Trying to get pregnant? Learn about ovulation signs and symptoms.
PSA levels: Can they rise after partial prostate removal?
A number of factors can cause PSA levels to rise after surgery for an enlarged prostate.
Passive-aggressive behavior: What are the red flags?
Learn about the signs of this indirect way of expressing negative feelings.
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