Infant health
Learning Center
Vitamin D deficiency
What are the risks of too little vitamin D?
Fallopian tubes: Is pregnancy possible with only one?
Pregnancy may be possible with one fallopian tube.
Male masturbation: Does frequency affect male fertility?
Male masturbation has little effect on sperm count or quality.
Yeast infection in men: How can I tell if I have one?
Yeast infections can occur in men, causing inflammation of the penis (balanitis). Learn what signs and symptoms could mean you have a yeast infection.
Sperm: How long do they live after ejaculation?
After ejaculation, the life span of sperm depends on the circumstances.
Mononucleosis: Can it recur?
Mono can return in some rare cases. Learn why that happens.
Can vaginal tears during childbirth be prevented?
Learn what you can do to help lower the risk of vaginal tears during childbirth.
COVID-19 drugs: Are there any that work?
Medicine can help people who are at risk of, diagnosed with, or have symptoms of COVID-19.
Unusual COVID-19 symptoms: What are they?
COVID-19 can cause a wide variety of symptoms, some more common than others. Learn about how COVID-19 can make you feel.
Can vitamin D protect against coronavirus disease 2019 (COVID-19)?
Find out what the research says about links between this key vitamin and the widespread viral infection.
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