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A functional ovarian cyst is a fluid-filled sac on your ovary. Most of these cysts are harmless and will go away on their own. But

Otitis externa is an inflammation or infection of the ear canal (the passage leading from the external ear to the eardrum) that

Osteomalacia is a condition in which the bones become soft. The cause of osteomalacia is not getting enough calcium or vitamin D

Osteoarthritis is usually called arthritis. Many people get this type of arthritis as they age. It happens when the cartilage that

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.

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

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