Fibromyalgia and multiple sclerosis are potentially debilitating disorders that lead to chronic pain. Fibromyalgia is characterized by muscle pain and stiffness, profound fatigue and difficulty sleeping.

Discovered in 1849, multiple sclerosis (MS) is a neurological disorder in which inflammation occurs in the white matter of the brain and spinal cord, according to the National Institute of Neurological Disorders and Stroke (NINDS).

Multiple sclerosis, or MS, is a condition that affects the central nervous system, consisting of the brain and spinal cord. Since the central nervous system controls the actions and activities of the body, the symptoms of MS can be quite variable.

Multiple sclerosis and rheumatoid arthritis are both chronic and crippling diseases that affect the quality of a patient's life. Rheumatoid arthritis affects the joints, while multiple sclerosis affects the brain and spinal cord.

Tremors, sometimes mistaken for a psychological problem, find their roots in a neurological condition. About 10 million people suffer from tremors, according to the Tremor Foundation.

Multiple sclerosis is a progressive neurological disease caused by damage to neurons in the brain and spinal cord. The damage occurs to the outer layer of the neurons, which is called the myelin sheath.

Multiple sclerosis is a physically debilitating disease that is still not fully understood by doctors. The most likely cause is the accidental destruction of nerves in the brain and spinal cord by the patient's own immune system.

A transcutaneous electrical nerve stimulation, or TENS machine, provides pain relief by sending low-voltage electrical impulses through electrodes placed on the skin to a painful area on the body. A TENS unit can lessen pain without the use of medication. A TENS machine is generally considered safe.

A vitamin B-12 deficiency can occur if you do not get enough of the vitamin in your diet or if you have a condition, such as Crohn's disease, which affects your absorption of the vitamin.

Progressive muscular weakness, muscle wasting, loss of coordination, balance problems and walking difficulties are characteristics of a number of diseases.