Just vitamin D -- deficiency (if you're not getting enough by being out in the sun) may cause all sorts of mild but strange nervous system symptoms, like passin

Just vitamin D -- deficiency (if you're not getting enough by being out in the sun) may cause all sorts of mild but strange nervous system symptoms, like passing numbness in various parts of your body and weak muscles (unfortunately these are also symptoms for anything from brain cancer, Lyme disease to Multiple Sclerosis, so I recommend seeing your doctor before spending too much time on Wikipedia).