Vitamin B-12 deficiency causes nerve pain or tingling, dementia, mental illness, tremors
and difficulty walking. Also when
vitamin B-12
and vitamin D
deficiency together can mimic multiple sclerosis, chronic fatigue syndrome and postpartom depression/phychosis. The way I found this info is I have some of these symtoms. I searched (surfed) the internet individual searches like vitamin A deficiency symptoms.and so on.It also could take up to a year to correct some deficiencies.