There many, many causes of neuropathy. The most common neuropathies are caused by diabetes, chemotherapy, lumbar disc disease, heavy metal poisoning, and environmental toxins. While infrared light therapy is by far the most effective and best tolerated treatment, there are many nutritional factors that support healing the nerves involved in neuropathy that should be used in combination with light therapy. Conventional treatment with multiple drugs that include anti-seizure medications, antidepressants, and narcotics should be reserved only for when infrared light therapy has failed.