Can vitamin d deficiency cause numbness in extremities?

Not sure: The vit d deficiency may have association with diabetic neuropathy, which cases numbness, but not as a separate finding of vit d hypovitaminosis. The vit d def. Can present with symptoms of musculoskeletal symptoms, such as bone pain, myalgias, and generalized weakness, chronic fatigue, age-related weakness, or even depression. Reference: http://www.Ncbi.Nlm.Nih.Gov/pmc/articles/pmc2912737/.

Numbness: Yes, it can cause numbness in the extremities as well as muscle spasms in hands and feet.