The first thing to consider is gastritis or gastric ulcer. Because the gastric mucosa is damaged, resulting in irritation to the gastric mucosa when gastric acid is secreted, manifested as gastric acid, stomach pain, slowed gastric peristalsis, food staying too long in the stomach, being fermented and producing gas, producing gastric distension, you can use drugs that inhibit gastric acid secretion, such as proton pump inhibitor omeprazole, H2 receptor antagonist cimetidine, gastric mucosa protector colloidal bismuth tartrate, drugs that promote gastrointestinal motility Domperidone, etc. If a stomach tumor is considered, a mass can be found in the upper abdomen, hard and poorly mobile, with clinical manifestations such as abdominal pain, emaciation, weakness and poor appetite.