These are conditions which involve the peripheral nervous system and muscles. Diseases of the peripheral nerves are known as peripheral neuropathy. The most common cause of neuropathy is diabetes but there are several other etiologies such as vitamin deficiencies, autoimmune diseases and demyelination. Most common complaints for neuropathy include numbness, tingling and pain. This is usually a progressive condition and help is available if caught early. Tests performed include nerve conduction studies and electromyography. Diseases of muscles are known as myopathy. These usually present with fatigue, weakness and at times pain. Some of these conditions may be inherited and others may be acquired diseases. Lab tests and electromyography are done to determine some of the causes of these conditions.