Nerve compression syndrome or compression neuropathy, also known as entrapment neuropathy, is a medical conditioncaused by direct pressure on a nerve. It is known colloquially as a trapped nerve, though this may also refer to nerve rootcompression (by a herniated disc, for example). Its symptoms include pain, tingling, numbness and muscle weakness. The symptoms affect just one particular part of the body, depending on which nerve is affected. Nerve conduction studies help to confirm the diagnosis. In some cases, surgery may help to relieve the pressure on the nerve but this does not always relieve all the symptoms. Nerve injury by a single episode of physical trauma is in one sense a compression neuropathy but is not usually included under this heading.