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. The cessation of breathing usually occurs because of a blockage (obstruction) in the airway.
Obstructive Sleep Apnea Obstructive sleep apnea occurs when a child stops breathing during periods of sleep.
Omphalocele An omphalocele is a birth defect in which some of the abdominal organs protrude through an opening in the abdominal muscles in the area of the umbilical cord. A translucent membrane covers the protruding organs.
Orbital and Ocular Tumors Learn more about the causes, symptoms and treatments for orbital and ocular tumors in children.
Orthopaedic Birth Defects Orthopaedic birth defects include a wide range of conditions affecting a baby’s bones and muscles, tendons and ligaments that connect them. Learn more about the causes, symptoms and treatments for orthopaedic birth defects.
Osteogenesis Imperfecta Osteogenesis imperfecta (OI), also known as brittle-bone disease, is a genetic (inherited) disorder characterized by bones that break easily without a specific cause. Learn more about this condition.
Osteosarcoma Osteosarcoma is cancer of the bone. It’s rare, but it is the most common type of bone cancer children and teens. Learn more about this condition.
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.