Newborn health
Learning Center
Too much vitamin C: Is it harmful?
Vitamin C is an essential nutrient, but too much carries its own risks.
Tumor vs. cyst: What's the difference?
A Mayo Clinic expert explains the differences and similarities between these two types of growths and how doctors determine if they're cancerous.
Uncircumcised penis: Is special care needed?
Know how to wash and care for your child's uncircumcised penis.
Underweight? See how to add pounds healthfully
If you're underweight and not happy about it, try these tips to help you achieve your goal weight.
Undigested food in stool: What does it mean?
Undigested food in stool generally isn't a problem unless it's accompanied by other symptoms.
Universal blood donor type: Is there such a thing?
Type O negative is sometimes called the universal blood donor type.
Unusual COVID-19 symptoms: What are they?
COVID-19 can cause a wide variety of symptoms, some more common than others. Learn about how COVID-19 can make you feel.
VLDL cholesterol: Is it harmful?
Like LDL cholesterol, very-low-density lipoprotein (VLDL) cholesterol is considered a type of 'bad' cholesterol.
Vaccines during pregnancy: Are they safe?
Find out which vaccinations you need while pregnant and which ones to stay away from.
Valerian: A safe and effective herbal sleep aid?
Valerian — Can this sleep aid help you sleep better?
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