Skin care
Learning Center
Types of dermatitis
Learn to identify types of dermatitis by how the skin looks. Examples include atopic dermatitis, contact dermatitis and seborrheic dermatitis.
Types of psoriasis
Learn to identify types of psoriasis, such as guttate psoriasis and scalp psoriasis, by appearance.
Ulcerative colitis
This type of inflammatory bowel disease affects the innermost lining of your digestive tract. Learn about available treatments for this often exhausting condition.
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?
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.
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.
Urinalysis
This common lab test checks urine for signs of disease and for clues about overall health.
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.
Vaping during pregnancy: Is it safe?
Vaping during pregnancy can expose your baby to nicotine.
Vascular rings
Learn more about this condition in which malformations of the aortic arch encircle the windpipe and esophagus and can press against them.
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