Usually happens when the digestive system is not able to absorb the vitamin. This can happen if: You have pernicious anemia. In this anemia, your body destroys the cells in your stomach that help you absorb vitamin B12.
Shortness of breath
Pale or yellowish skin
Numbness or tingling in your hands and feet
Mental confusion or forgetfulness
General practitioner appointment
Complete blood count (CBC)
Stool analysis - Protozoans and Helminths (microscopy)