As I have mentioned couple of times previously, numbness various part of body could be usually caused by peripheral neuropathy
which is damage caused to the peripheral nerves. This in turn is most commonly caused by Diabetes Mellitus
, Smoking or excess alcohol consumption. In some cases, Vitamin B 12 deficiency, multiple sclerosis
may also cause these kind of symptoms. If you were my patient, I would do a thorough physical and neurological examinations, I would check your BP, fasting blood sugar, do some blood tests to know vitamin deficiencies.