The symptoms associated with neuropathy vary, depending upon where the affected nerve is located in the body. Damage may have occurred to one or more types of nerves. Some symptoms that are commonly seen in cases of neuropathy are cramps, spasms, and muscle weakness. Occasionally, neuropathy can cause symptoms that include loss of balance and muscle coordination. Nerve damage can also cause numbness, pain, and tingling in affected areas. The pain seen in neuropathy is typically described as "freezing, burning, or like an electrical charge", or "extreme sensitivity to touch". Neuropathy usually refers to cases of peripheral neuropathy or damage to the peripheral nervous system. It could be caused by disease processes or the side effects of certain illnesses. Some cases of neuropathy affect only one nerve. This type of nerve damage is known as "mononeuropathy". Mononeuropathy is usually caused by the nerve being physically compressed. One well known example is carpal tunnel syndrome- a disorder caused by compression of the nerves in the hand and wrist. The common feeling of "pins and needles" is one example of nerve compression, although temporary in duration. The usual cause is temporary interruption of the blood supply to the affected area, such as when a sleeper lies on their hand or arm for an extended period. Polyneuropathy is another type of neuropathy where nerve cells in multiple areas of the body are affected, most commonly caused by Diabetes. The myelin covering of nerve cells are degraded, which prevents electrical impulses normally generated by these cells from being transmitted properly. This causes symptoms in multiple parts of the body, many times they are experienced on both sides of the body at one time. The main symptoms are muscle weakness and lack of coordination, tingling or burning, and dizziness. In addition to diabetes, other potential causes of polyneuropathy include vitamin deficiencies, lyme disease, toxins, and blood disorders. This type of neuropathy usually progresses very slowly, but occasionally can be more rapid in its advance. If symptoms are caused by high glucose levels associated with diabetes that can often be reversed with changes in diet and exercise.