Hyperacidity is generally not a manifestation of vitamin deficiency. Vitamin deficiency can make the gastrointestinal tract lack of tone, making poor peristalsis affect the secretion of gastric acid, and does not cause symptoms of hyperacidity. Vitamin deficiencies may manifest as dry skin, mouth ulcers, and scurvy. Lack of vitamin B₁₂ may cause a large decrease in the secretion of stomach acid, so the lack of vitamins does not cause hyperacidity. Excessive stomach acid may be caused by the usual bad dietary habits, such as often drinking alcohol, eating cold and spicy food, etc. These dietary habits will stimulate the mucous membrane of the stomach and cause excessive secretion of stomach acid. If you are overly nervous and stressed, it can also cause the nerves innervating the stomach to become disorganized, resulting in excessive secretion of stomach acid. If you have excessive stomach acid, it is recommended that you consult a doctor promptly and use medication if necessary.