Judging from the usual intestinal symptoms: 1. Abnormal digestive function. Some patients with too little gastric acid secretion are prone to abnormal digestive function in the gastrointestinal tract, and are prone to constipation or diarrhea, which can easily cause iron deficiency anemia. The patient often feels discomfort in the upper abdomen and is prone to indigestion, burping and a burning sensation in the chest. 2. bloating. Patients with low stomach acid tend to feel bloated because food accumulates in the intestines and there is no stomach acid to digest it, resulting in excessive accumulation of food in the stomach and intestines, which can easily produce gas and cause bloating and abdominal pain. 3, other symptoms. In addition to abnormal digestive function, too little gastric acid can lead to a decrease in intestinal absorption, which can lead to malnutrition, iron deficiency anemia or chronic gastritis.