Problems with the gut can cause poor absorption of Vitamin B12 leading to a whole host of problems.
[url=http://symptoms.webmd.com/default.htm]WebMD Symptom Checker[/url] is good for checking.
For example peripheral neuropathy & mini-strokes can be caused by this.
[url=http://www.webmd.com/a-to-z-guides/vitamin-b12-deficiency-anemia-treatment-overview]
Vitamin B12 Anaemia Treatment[/url]