When the Parietal cells get damaged, it fails to produce the intrinsic factor which in turn leads to an issue in absorbing Vitamin B12 in the small intestine. This leads to Vitamin B12 deficiency in the body. The progression of this disease is slow in the body and so, the victim gets used to the following symptoms – headache, weight loss, weakness, pale skin, and fatigue.In severe cases, the victim might suffer from memory loss, unsteady gait, depression, and peripheral neuropathy. Pernicious anemia is a genetic disorder that prevents the child from synthesizing intrinsic factors. Depending on the level of intrinsic factor deficiency, the victim is firstly injected with doses of Vitamin B12 for a period. Then, the regular oral dosage is prescribed based on the condition.