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Learning Center
Vaping during pregnancy: Is it safe?
Vaping during pregnancy can expose your baby to nicotine.
Vaginal agenesis
In this rare condition that occurs before birth, the vagina doesn't develop and the uterus may only develop partially or not at all. Learn about treatment.
Urinalysis
This common lab test checks urine for signs of disease and for clues about overall health.
Ureteral obstruction
Learn about what causes blockage of the tubes that carry urine from the kidneys to the bladder, tests you might need and how the condition can be treated.
Unusual COVID-19 symptoms: What are they?
Find out about the unusual symptoms of coronavirus disease 2019 (COVID-19), including COVID toes, nausea, and loss of smell or taste.
Undescended testicle
Learn about causes, complications and treatment of this condition in which one or both testicles aren't in the usual place within the scrotum.
Uncircumcised penis: Is special care needed?
Know how to wash and care for your child's uncircumcised penis.
Umbilical hernia
Learn about this condition in which your intestines create a bulge near your navel.
Ultraprocessed foods: Convenience at what cost?
Ultraprocessed foods, such as frozen dinners, are staples for many Americans. Why do these convenience foods have a bad rep?
Types of psoriasis
Learn to identify types of psoriasis, such as guttate psoriasis and scalp psoriasis, by appearance.
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