Hi there I understand your concern...but we need little more elaborated history to help you in a better way...still I will advise based on short history provided here...possible causes are chronic alcohol consumption,vitamin b12 deficiency,certain autoimmune diseases,diabetic neuropathy,multi vitamins deficiency,vitamin D deficiency,calcium deficiency......so underlying cause should be identified first...I would suggest you to consult nearest physician for clinical examination they will do the needful...regards.