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Osgood-Schlatter disease is a knee problem that causes pain and swelling in the shinbone (tibia) just below the kneecap (patella)

Orchitis is an inflammation or infection of the testicle, often caused by a virus or bacteria. Symptoms of orchitis include pain

Opticians are skilled technicians who fill optical prescriptions and fit people with glasses or contact lenses. Opticians, unlike

The optic nerve is the nerve at the back of the eye that carries visual information from the eye to the brain.

Oppositional defiant disorder (ODD) is a pattern of hostile behavior by children and teens toward their parents or other authority

Opportunistic infections occur in people whose immune systems have been weakened by a disease, such as AIDS. An opportunistic

An opioid is a drug that can suppress the perception of pain and calm a person's emotional response to pain. It does this by

The foramen ovale is an opening in the part of the heart that separates the upper right and left chambers (atria). In a fetus

Open-angle glaucoma is the most common type of glaucoma, in which slow damage to the optic nerve in the back of the eye causes

White-coat hypertension means that your blood pressure is high when it's checked in a doctor's office or clinic. But your blood