An upset stomach after a meal is a sign of indigestion. You can take medication to help digestion, such as stomachic tablets or morpholine. Morpholine can promote gastric power, help stomach peristalsis, used to treat indigestion caused by gastric distension, nausea, vomiting phenomenon. You should be careful not to eat too greasy, poorly digested food to avoid the stomach’s digestive function and cause gastric distension. If you’re not comfortable with your stomach after a meal, consider chronic gastritis, you should do a gastroscopy to determine the disease and treat it. Gastritis is divided into atrophic gastritis and non-atrophic gastritis, and the type of disease needs to be determined before it can be treated symptomatically. If you have chronic gastritis, you must pay attention to control your diet and not overeat.