Obesity Overweight and obesity together represent the second leading preventable cause of death in the United States. Obesity is a serious, chronic disease that can inflict substantial harm to a person's health.
Obsessive-Compulsive Disorder Obsessive-compulsive disorder (OCD) includes thoughts and obsessions (impulses or images) that occur over and over, and that cause a child or teen to feel a great deal of distress.
Obstructive Sleep Apnea Obstructive sleep apnea occurs when a child stops breathing during periods of sleep.
Obstructive Sleep Apnea Obstructive sleep apnea occurs when a child stops breathing during periods of sleep. The cessation of breathing usually occurs because of a blockage (obstruction) in the airway.
Omphalocele An omphalocele is a birth defect, which is an abnormality that occurs before birth as a fetus is forming in its mother's uterus.
Orbital and Ocular Tumors Learn more about the causes, symptoms and treatments for orbital and ocular tumors in children.
Orthopaedic Birth Defects Learn more about the causes, symptoms, and treatments for orthopaedic birth defects.
Osteogenesis Imperfecta Osteogenesis imperfecta, also known as brittle-bone disease, is a genetic (inherited) disorder characterized by bones that break easily without a specific cause.
Otitis Externa (Swimmer's Ear) Otitis externa, also called swimmer's ear, is an inflammation of the external ear canal.
Otitis Media (Middle Ear Infection) Otitis media is inflammation located in the middle ear. Otitis media can occur as a result of a cold, sore throat, or respiratory infection.