Peripheral Neuropathy

What is peripheral neuropathy?

Peripheral neuropathy is a term used to describe problems with the nerves of the peripheral nervous system. It is also called nerve palsy. The peripheral nervous system is the term used for all the nerves outside the brain and spinal cord. Peripheral nerves transmit information from the brain and spinal cord to every other part of the body. They connect your brain and spinal cord to your muscles and allow you to move your muscles. They also conduct sensations such as pain, temperature, and touch to your brain. The nerves connecting to internal organs that allow you to do things like breathe and digest food are also part of the peripheral nervous system.

How does it occur?

Peripheral neuropathy can have many different causes. Anything that interferes with the function of a nerve can lead to neuropathy. Some common causes are:

• direct injury to the nerve, such as a sports injury
• pressure on a nerve caused by repetitive use (such as carpal tunnel syndrome), improper use of crutches, or an abnormal growth, such as a tumor
• diseases such as diabetes, arthritis, lupus, or alcoholism
• infections (usually viral, for example, infections by the herpes virus)
• exposure to poisons and some medicines, such as some cancer medicines
• a lack of vitamins, such as vitamin B-12, or minerals.

What are the symptoms?

The symptoms of peripheral neuropathy depend on which nerves are damaged.

• Nerves that help you move your muscles are called motor nerves. If motor nerves are damaged, you may have muscle weakness or you may not be able to move the muscles controlled by the damaged nerves.
• Nerves that conduct sensations, such as touch, are called sensory nerves. When these nerves are affected, you may have numbness, tingling, pain, or extreme sensitivity to touch.
• The nerves controlling internal organs are called autonomic nerves. Symptoms caused by damage to these nerves depend on what organs are affected. For example, you may have vision problems if the nerves to your eyes are involved. Problems with other nerves may cause dizziness, leaking of urine from the bladder, or digestion problems, such as constipation or diarrhea.

How is it diagnosed?

Your health care provider will ask about your symptoms and medical history and will examine you. You may have a nerve conduction test to check the function of specific nerves. You may have other tests.

How is it treated?

The treatment depends on the cause. For example:

• If the problem happens after an injury, depending on how severe the injury is, the neuropathy may go away on its own and not need any specific treatment.
• If it is caused by a disease such as diabetes or lupus, the treatment is focused on better control of the disease.
• If the cause is a vitamin deficiency, your provider may prescribe vitamin supplements.

The symptoms of neuropathy can be treated with medicines that decrease nerve conduction. For example, the oral medicine gabapentin (Neurontin) can help relieve pain.

Other possible treatments for nerve pain are:

• biofeedback (a way to control your body's responses with your mind) or relaxation methods
• electronic nerve stimulation devices
• shots of local anesthetics, steroids, or other medicines to block pain signals or decrease inflammation
• in severe cases, surgery to cut the nerve causing the pain.

How long will the effects last?

Peripheral neuropathy caused by an injury usually lasts from a few days to several weeks, depending on the injury. Neuropathy due to diabetes and other chronic diseases tends to not go away completely, but it may improve with treatment of the disease. Neuropathy caused by a viral infection is less predictable. It may or may not go away with time.

How can I take care of myself?

If you have a disease, such as diabetes, the best way to take care of yourself is to follow your health care provider's advice and take your medicines as prescribed. If the cause of your neuropathy is an injury, the best thing you can do is to try to protect that body part from further injury.

How can I help prevent neuropathy?

Sometimes it is hard to avoid injuries that cause neuropathy. If it is caused by a disease, proper treatment of the disease is the best means of prevention. Follow your health care provider's advice and take your medicines as prescribed. Eat a healthy diet that includes fruits, vegetables, whole grains, and lean meat to give you enough vitamin B-12.

For more information contact:

Neuropathy Association
Phone: 713-862-9332
Web site: http://www.neuropathy.org.