My right foot is numb, what could it be and what can i do?

See your doctor.: Could be neurological or vascular insufficiency, and may be serious.

Nerve, Vascular, CNS: Numbness of the entire right foot may be related to poor blood supply (diabetes, peripheral vascular disease) or to compromise of the nerves further away that innervate the foot ....Partial foot numbness may be related to other factors such as nerve impingement at the spinal level. Partial numbness may be related to a central nervous system issue. In either case, professional help is needed.