Vitamin deficiency anemia usually develops slowly over several months to years. Signs and symptoms may be subtle at first but usually increase as the deficiency worsens. These may include: 
Fatigue
Shortness of breath
Dizziness
Pale or yellowish skin
Irregular heartbeats
Weight loss
Numbness or tingling in the hands and feet
Muscle weakness
Personality changes
Unsteady movements
Mental confusion or forgetfulness
