Nutrition basics
Learning Center
Truncus arteriosus
Learn more about this congenital heart defect that makes it difficult for the heart to pump the right amount of blood to the lungs and the body.
Turner syndrome
Turner syndrome affects only females as the result of a missing or partially missing X chromosome, causing a variety of medical and developmental problems.
Umbilical cord care: Do's and don'ts for parents
Find out how to keep the area clean and dry, and when to call the doctor.
Umbilical hernia
Learn about this condition in which your intestines create a bulge near your navel.
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.
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.
Unexplained weight loss
Unexplained weight loss has many causes — some serious. Find out when losing weight without trying calls for a medical evaluation.
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.
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.
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