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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

Fluid in the space behind the eardrum (middle ear) is called otitis media with effusion. It occurs when a eustachian tube (which

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

Osteoporosis is a disease that makes your bones thin, brittle, and easy to break. It's related to the loss of bone mass that

Osteomyelitis is an infection of the bone, often developing from a wound or after an open fracture in which the bone pokes through

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

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

Orthostatic hypotension is a rapid and sudden decrease in blood pressure that occurs when a person changes position, such as

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