Fitness basics
Learning Center
Can vitamin D protect against coronavirus disease 2019 (COVID-19)?
Find out what the research says about vitamin D and coronavirus disease 2019 (COVID-19).
Runny nose
Learn more about how to treat this common symptom and when to see a health care provider.
Vasectomy
Find out more about this procedure that provides nearly 100 percent effective male birth control by cutting the supply of sperm to semen.
Bone marrow transplant
Learn about this procedure that replaces unhealthy bone marrow with stem cells. Your own cells, donor cells or cells from umbilical cord blood may be used.
Active surveillance for prostate cancer
Learn about why doctors may recommend active surveillance for prostate cancer and what to expect.
Rheumatic fever
Learn about this complication of strep throat and scarlet fever and what you can do to prevent it.
Color blindness
Is it red or is it green? Learn more about what causes color blindness and how to tell whether or not you can distinguish between certain shades of color.
Male masturbation: Does frequency affect male fertility?
Male masturbation has little effect on sperm count or quality.
Tonsillectomy
Learn how to prepare for a tonsillectomy and what to expect from the surgery.
Hydronephrosis
Learn about this condition that occurs when urine doesn't drain properly from the upper urinary tract, leading to kidney swelling.
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