Stomach distension and pain may be caused by improper diet, intestinal obstruction disease, mental abnormality and so on. 1. Improper diet: when patients eat a lot of indigestible food, greasy food or eat too fast, it may lead to gastrointestinal dysfunction, indigestion, and so on, and thus patients will have bloating and pain. 2. Intestinal obstructive diseases: when patients suffer from intestinal obstructive diseases, such as intestinal obstruction, gastric polyps, tumors, intestinal tumors, etc., it may cause gastric distension and pain, and patients may also be accompanied by vomiting symptoms. 3. Mental abnormality: when the patient is under too much mental stress, or in long-term tension, anxiety and other bad moods, it may cause vegetative nerve disorders or affect the normal function of the stomach and intestines, which may cause gastric distension and pain. It is recommended to consult a doctor in time and carry out targeted treatment under the guidance of the doctor. In life, maintain a good mood, develop good living habits or eating habits, and at the same time do a good job of monitoring the condition, if there is any abnormality in a timely manner to seek medical attention.