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Hydrocele
Find out more about the symptoms, causes and treatments for this swelling in the scrotum.
How you hear
Your ears enable you to gather and interpret sounds from the world around you.
How do COVID-19 antibody tests differ from diagnostic tests?
Antibody testing shows whether you've had the COVID-19 virus in the past. It's not the same as testing to see whether you have the virus now.
Hormone therapy for prostate cancer
Find out what to expect during testosterone-blocking therapy. Learn about choices, including medicines and surgery.
Hip fracture
The risk of breaking a hip increases with age. Learn about lifestyle changes that can keep bones strong and reduce risk of breaking.
High-dose flu vaccines: How are they different from other flu vaccines?
High-dose flu vaccines are flu vaccines for older people.
Hemolytic uremic syndrome (HUS)
Damage to the small blood vessels in the kidneys can cause clots that clog the organ's filtering system. This can lead to life-threatening kidney failure.
Healthy sperm: Improving your fertility
You can take simple steps to have healthy sperm and improve your fertility.
HPV infection: A cause of cancer in men?
Learn what types of cancer human papillomavirus can cause and how you can lower your risk.
HCG diet: Is it safe and effective?
Learn about the risks of this dangerous diet.
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