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Learning Center
Hand swelling during exercise: A concern?
This condition is a common problem, but rarely serious enough to disrupt your routine.
Headaches and hormones: What's the connection?
Headaches are part of life for many people. Understand how hormones can play a role.
Healthy meals start with planning
It's easy to put healthy meals on the table with a little planning. This guide will show you how to create balanced meals with proper portion sizes.
Healthy sperm: Improving your fertility
You can take simple steps to have healthy sperm and improve your fertility.
Hemangioma
This red mark on a baby's skin looks like a rubbery bump or flat red mark and is made up of extra blood vessels in the skin. It generally goes away by age 10. Learn more about its causes and treatment.
Hemorrhoids
There are many effective options for easing the discomfort of hemorrhoids — swollen veins in the anus and lower rectum.
Hepatitis C: How common is sexual transmission?
Although hepatitis C is highly contagious, the risk of sexual transmission is very low.
Hormone therapy for prostate cancer
Find out what to expect during testosterone-blocking therapy. Learn about choices, including medicines and surgery.
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.
Hydrocele
Find out more about the symptoms, causes and treatments for this swelling in the scrotum.
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