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A nasal polyp is a mass of swollen, mucus-covered tissue that grows out from the sinuses into the nasal passages inside the nose

Narcolepsy is a sleep disorder that mixes the nervous system's messages about when to sleep and when to be awake. Narcolepsy

Some medical tests report results in nanograms per milliliter per hour. A nanogram is one-billionth of a gram. A gram is about 1

Numbness is the inability to feel anything when your skin is touched. Tingling (paresthesia) is a pins-and-needles sensation, like

Obesity is having an excess amount of body fat for your height. It raises your risk for serious health problems. These include

Ovulation is the release of a mature egg from an ovary during the menstrual cycle. Ovulation dates vary widely from woman to woman

Ovarian hyperstimulation syndrome is the overstimulation of the ovaries that may occur as a result of in vitro fertilization (IVF)

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

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

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