First trimester
Learning Center
Prader-Willi syndrome
Prader-Willi syndrome is a rare genetic disorder that results in physical, mental and behavioral problems, including a constant sense of hunger.
Delayed ejaculation
Learn what can cause delayed or absent ejaculation and how it can be treated.
Coronavirus disease 2019 (COVID-19)
Coronavirus disease 2019 (COVID-19) is an illness caused by the virus SARS-CoV-2. Learn more about the symptoms, risks and ways to protect yourself.
Chiari malformation
Learn about this brain condition in which brain tissue extends into the spinal canal.
Patent ductus arteriosus (PDA)
Learn about symptoms, causes and treatment of this common — and treatable — heart problem that occurs shortly after birth.
Uncircumcised penis: Is special care needed?
Know how to wash and care for your child's uncircumcised penis.
Vesicoureteral reflux
Learn about what happens if urine flows backward from the bladder. Usually found in children, this condition boosts the risk of urinary tract infections.
Dermatitis
Learn about the symptoms, causes and treatments of this itchy skin condition that affects children and adults, and about how moisturizers help prevent it.
Groin pain (male)
Learn more about the causes and symptoms of this type of pain. Also find out how you can treat it at home and when to get a checkup.
Traveler's diarrhea
Learn how to avoid contaminated food and water that may lead to this common travel hazard. Plus, find out what to do if it strikes.
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