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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

A nasal cannula is a flexible plastic tube that has a set of two prongs that can be placed in the nostrils. The tube is connected

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

Oral cancer is the growth of abnormal cells in any part of the mouth or lips. Most oral cancers start in the lining of the lips or

Oximetry is a medical test that uses a device called an oximeter to measure the amount of oxygen in the blood (oxygen saturation)

The ovaries are two small glands, located on either side of the uterus, that are part of the female reproductive system. The

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