Hello there.... Numbness and tingling can be caused by a number of factors including: Remaining in the same position (seated or standing) for a long time....Injury or pressure on a nerve....Pressure on the spinal nerves due to a herniated disk....Lack of blood supply to an area ....Side effects from certain medications.... lack of vitamin B12 or other vitamins....From radiation therapy....Toxic action on the nerves, such as from alcohol, tobacco, or lead.....Consult Physician for further evaluation....