Fitness basics
Learning Center
Male hypogonadism
This condition affects the ability of men's bodies to produce enough testosterone or enough sperm or both.
Loss of taste and smell: Natural with aging?
Aging can play a role in the loss of taste and smell — but not always.
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.
Hypothyroidism: Can it cause peripheral neuropathy?
Hypothyroidism can cause damage to peripheral nerves and can lead to conditions such as carpal tunnel syndrome.
Hypothyroidism and infertility: Any connection?
For women, there's sometimes a link between having an underactive thyroid gland (hypothyroidism) and infertility.
How opioid use disorder occurs
Opioids act on the brain in powerful and potentially dangerous ways. Find out why no one is safe from opioid use disorder and learn what raises the risk.
How fit are you? See how you measure up
Find your fitness level with these simple fitness tests.
Hepatitis C: How common is sexual transmission?
Although hepatitis C is highly contagious, the risk of sexual transmission is very low.
Hemorrhoids
There are many effective options for easing the discomfort of hemorrhoids — swollen veins in the anus and lower rectum.
Heart rate: What's normal?
A normal resting heart rate for adults ranges from 60 to 100 beats per minute. A heart rate above or below that may signal a problem.
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