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Nonsteroidal anti-inflammatory drugs (NSAIDs) are used to relieve pain and fever and to reduce swelling and inflammation caused by

The normal sinus rhythm is the rhythm and rate of impulses generated by certain muscle cells as a signal to the upper heart

Medicines you can buy without a prescription are called nonprescription or over-the-counter (OTC) medicines. They may be taken to

A neutrophil is the most common type of white blood cell, the cells that protect the body against infection by destroying bacteria

Neurofibromatosis is a group of genetic conditions that cause tumors to grow on nerves and produces abnormalities in the bones and

A neural tube defect (NTD) is a birth defect that occurs when the spine, the brain, or the bone and skin that protect them do not

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

Spinal nerve roots branch out from each side of the spinal cord and then join to form the spinal nerves, which pass through

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

Some medical tests report results in nanograms (ng) per liter (L). A nanogram is one-billionth of a gram. A gram is about 1/30 of