Healthy retirement
Learning Center
Herd immunity and COVID-19: What you need to know
To protect groups of people over time, it helps to know what level of recovery or vaccination in a population makes it hard for a germ to spread.
Post-vasectomy pain syndrome
Learn about post-vasectomy pain syndrome (PVPS) — How it happens after a vasectomy, tests to diagnose it and treatment options.
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.
Enterovirus D68 and parechovirus: How can I protect my child?
Enterovirus D68 and parechovirus infections can lead to serious illness among children. Know the symptoms and what you can do.
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.
Dietary supplements for erectile dysfunction: A natural treatment for ED?
Some dietary supplements for erectile dysfunction might work and some might be dangerous. Get the facts.
Low sperm count
Having a low sperm count can make conceiving a child difficult, but not necessarily impossible. Learn about possible causes and treatment.
Genetic testing for breast cancer: Psychological and social impact
Prepare for your hereditary cancer gene test by learning how genetic testing for breast cancer may affect you and your family members.
Prostate biopsy
Find out about this procedure that's used to diagnose prostate cancer. Learn about the risks, how to prepare and what you can expect.
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