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Oppositional defiant disorder is one of the commonly diagnosed disruptive behavior disorders in children and adolescents.

An optic nerve glioma (also called an optic pathway glioma) is a slow-growing brain tumor that arises in or around the optic nerve, which connects the eye to the brain.

Orbital cellulitis and periorbital cellulitis are inflammation and infection of the tissue and skin surrounding the eye.

Osgood-Schlatter disease is an overuse condition or knee injury that causes a painful bump and swelling on the shinbone.

Odontogenic tumors are any kind of abnormal growth in and around the jaw and teeth; many of these tumors are considered to be benign.

Optic neuritis (ON) involves an attack of inflammation (swelling) in your optic nerve.

Osteochondritis dissecans is a joint disorder in which a segment of bone and cartilage starts to separate from the rest of the bone.

Osteomyelitis is the term for a bone infection.

Osteosarcoma is the most common type of bone cancer among children, adolescents, and young adults.

A child or adolescent with obsessive-compulsive disorder has obsessive thoughts that are unwanted and related to fears, and uses compulsive rituals to control the fears.