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The nervous system includes the brain, the spinal cord, and all the nerves in the body. Nerves carry information through the

Nystagmus is involuntary movement of the eyes. These eye movements may be slow or fast, steady or jerky, and the eyes may move

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

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

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

Nephrotic syndrome is a warning sign that something is damaging your kidneys. It causes high levels of protein in the urine and

When people use tobacco products on a regular basis, their bodies develop a need for nicotine. If they don't get nicotine, they

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