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Learning Center
Male hypogonadism
This condition affects the ability of men's bodies to produce enough testosterone or enough sperm or both.
Retrograde ejaculation
Learn about the symptoms and treatment options for this condition that can cause male infertility.
Erectile dysfunction: Nonoral treatments
Get the facts about shots, penis pumps and other ED treatments that don't involve taking medicine by mouth.
Dietary supplements for weight loss
Do dietary supplements help with weight loss? Are they safe? Get the facts.
Lung nodules: Can they be cancerous?
Lung nodules are common. Most aren't cancer. Find out what tests might be recommended if you have a lung nodule.
Gallbladder polyps: Can they be cancerous?
The size of gallbladder polyps can be a useful predictor of whether they're cancerous.
Adult bed-wetting: A concern?
Adult bed-wetting is uncommon and requires evaluation by a doctor. Learn about possible causes.
Low blood sodium in older adults: A concern?
For older adults, low blood sodium, known as hyponatremia, can cause death if left untreated.
Spastic colon: What does it mean?
This term is sometimes used to refer to irritable bowel syndrome (IBS) — but how accurate is it?
Hyperinsulinemia: Is it diabetes?
Hyperinsulinemia often is associated with type 2 diabetes.
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