There are many diseases of the digestive tract, but they are often overlooked because the symptoms are not obvious. However, if there are some typical symptoms, self-examination can be performed according to them. 1.People who feel pain and obstruction behind the sternum when eating, which is sometimes light and sometimes heavy, may have esophagitis, esophageal diverticulum or early esophageal cancer. 2, fullness after meals or fullness all day long, belching but not acid reflux, poor appetite, gradual weight loss, mild pallor or graying, middle-aged and elderly people should think of chronic gastritis, especially chronic atrophic gastritis, gastric prolapse. 3. Pain in the upper and middle abdomen after meals, or a sense of nausea, vomiting, or accumulation of food. The history can be many years, often in the fall, the pain may be rhythmic, such as cold, anger, eating irritating food can be triggered, may be gastric ulcer. 4. Stomach pain often starts 2 hours after meal, or wakes up in the middle of the night with pain, can be relieved by eating something, often with acid reflux. It is easy to occur in autumn and winter, and the pain is on the right side of the upper abdomen, often rhythmic, so think of duodenal ulcer or inflammation or diverticulum. 5.After meal, abdominal distension and pain, often with nausea, vomiting, occasionally vomiting blood, with past history of gastric disease aggravated recently, or without past history of gastric disease only recently, and accompanied by anemia, emaciation, not thinking of eating, hard lumps felt at the umbilicus or heart, then consider gastric cancer. 6. Sudden onset of severe pain in the upper abdomen, possibly with a history of unclean diet or cold, restlessness, pale and cold sweat, cold limbs, hard lump in the upper and middle abdomen but cannot be touched, which may be relieved by itself after 1-2 hours, may be stomach cramps. Hard stomach can not be touched may be an acute perforation of ulcer disease. 7, walking or running when one side of the stomach pain, forced to stop, often in the fart or rub the abdomen after relief, local or lump, no pain when the lump disappears, this may be colonic spasm or liver and spleen flexure syndrome. 8, abdominal pain and diarrhea occur after eating carelessly or getting cold, may be accompanied by vomiting, chills and fever, may be acute gastroenteritis, acute dysentery. 9, diarrhea immediately after meals, eat a meal diarrhea once, a little cold or eating carelessly onset, sometimes diarrhea and sometimes constipation, diarrhea for watery, constipation mucus more, sometimes abdominal distension with the intention to go to the toilet and no stool, several years did not see the loss of weight, the possibility of chronic allergic enteritis.