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A nebulizer is a device used to deliver liquid medicine in the form of a fine mist (aerosol). Medicine may be given through a

Nearsightedness is most often caused by a natural change in the shape of the eyeball that makes the eyeball too long, so that it

Last reviewed: 3/4/2021

A nasogastric (NG) tube is a long flexible tube inserted into a person's nose and threaded into the stomach to deliver fluid that

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

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 nanomoles (nmol) per liter (L). A mole is an amount of a substance that contains a large

Some medical tests report results in nanomoles (nmol). A mole is an amount of a substance that contains a large number (6 followed

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