Nutrition basics
Learning Center
Patent foramen ovale
Learn more about the causes and complications of this condition in which a hole in the heart doesn't close the way it should after birth.
Patent ductus arteriosus (PDA)
Learn about symptoms, causes and treatment of this common — and treatable — heart problem that occurs shortly after birth.
Parvovirus infection
Learn more about the symptoms, causes, treatment and prevention of this common childhood infection — sometimes called slapped-cheek disease.
Partial anomalous pulmonary venous return
In this heart problem present at birth, some of the blood vessels of the lungs connect to the wrong places in the heart. Learn when treatment is needed.
Osteosarcoma
Learn about the symptoms and causes of this bone cancer that happens most often in children. Find out about treatments, including limb-sparing operations.
Osteochondritis dissecans
Osteochondritis dissecans most commonly affects children who are very active in sports. Learn about the symptoms and treatment of this joint condition.
Oppositional defiant disorder (ODD)
This childhood mental health condition includes frequent and persistent anger, irritability, arguing, defiance or vindictiveness toward authority.
Obsessive-compulsive disorder (OCD)
OCD features unwanted thoughts and fears, or obsessions. These obsessions lead to repetitive behaviors, also known as compulsions, that get in the way of daily activities.
Norovirus infection
This highly contagious virus spreads through contaminated food, water or surfaces and causes vomiting and diarrhea. Learn ways to protect yourself.
Noonan syndrome
This genetic condition stops typical development in parts of the body. It may include unusual facial features, short height, heart problems or other issues.
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