The symptoms of small stomach pain and chest distension are commonly caused by indigestion, chronic gastritis, gastric insufficiency, gastroenteritis or gastrointestinal dysfunction. If a woman has a delayed menstruation, has a normal sexual life and does not take contraceptive measures, she should also rule out pregnancy, and can use early pregnancy test paper to detect it. If it is caused by chronic gastroenteritis and indigestion, you can take oral treatment of stomach medicine cimetidine, morpholine, bifidobacterium, rehabilitation new liquid, etc.; or use Chinese herbal medicine for soothing the liver, regulating qi and stomach, such as dredging liver and stomach pill. Don’t eat cold, spicy and stimulating food, avoid smoking and alcohol, and avoid hot and cold stimulation. If it is functional indigestion or overeating, dysbiosis, you can take oral probiotics, stomach and appetite tablets, etc. You should eat light, easy-to-digest food.