Fitness basics
Learning Center
Headaches and hormones: What's the connection?
Headaches are part of life for many people. Understand how hormones can play a role.
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.
Hemorrhoids
There are many effective options for easing the discomfort of hemorrhoids — swollen veins in the anus and lower rectum.
Henoch-Schonlein purpura
Learn about the symptoms, causes and treatment of this blood vessel disease, also called IgA vasculitis, that causes a purplish rash on the lower legs.
Hepatitis C: How common is sexual transmission?
Although hepatitis C is highly contagious, the risk of sexual transmission is very low.
How fit are you? See how you measure up
Find your fitness level with these simple fitness tests.
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.
Hypothyroidism and infertility: Any connection?
For women, there's sometimes a link between having an underactive thyroid gland (hypothyroidism) and infertility.
Hypothyroidism: Can it cause peripheral neuropathy?
Hypothyroidism can cause damage to peripheral nerves and can lead to conditions such as carpal tunnel syndrome.
Keloid scar
Learn about how to prevent, remove or flatten these problematic raised scars that form over scars from acne, tattoos, piercing and other injuries.
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