Chronic atrophic gastritis with enteric farting and sudden weight loss may be caused by indigestion, gastric cancer, etc., and need to be further examined in the hospital for dietary modification, medication, and surgical treatment. 1. Indigestion: Chronic atrophic gastritis with enterocolitis may lead to poor nutritional absorption and peristaltic function of the stomach, as well as the accumulation of gas in the digestive tract, resulting in the symptom of thinness and farting. If after reviewing the gastroscopy and pathology biopsy, still the disease has not progressed, you can eat less and more frequent meals, appropriate meal nutrition, to take less cold, greasy, spicy and stimulating food, avoid smoking and alcohol. You can also take medicines to protect gastric mucosa such as colloidal bismuth pectin and bismuth potassium citrate. 2. Gastric cancer: chronic atrophic gastritis with enterocolitis continues to progress and may lead to cancer with symptoms of wasting and farting. After review, if gastric cancer is diagnosed, tumor resection or total gastrectomy can be performed. If you have symptoms of chronic atrophic gastritis with enterocolitis and farting and suddenly losing weight, it is not recommended to use medication by yourself, and it is recommended to go to the hospital for rechecking and treatment under the guidance of the doctor.