Healthy retirement
Learning Center
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.
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.
Types of dermatitis
Learn to identify types of dermatitis by how the skin looks. Examples include atopic dermatitis, contact dermatitis and seborrheic dermatitis.
Type 1 diabetes in children
Know what symptoms to look for, as well as more about diagnosis, treatment and daily living with this lifelong insulin-dependent condition.
Type 1 diabetes
Learn about the symptoms, causes, treatment of this chronic condition in which the pancreas produces little or no insulin.
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.
Tuberous sclerosis
This uncommon genetic disorder causes tumors that are not cancer. These tumors are unexpected overgrowths of tissue in different parts of the body.
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.
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