The main symptoms are: 1. abdominal distension, mainly caused by eating too much food, indigestible, greasy and cold food. 2. belching, due to the large amount of food left in the gastrointestinal tract and accumulated in the gastrointestinal tract. The main symptoms are: 1) abdominal distension, which is caused by eating too much, indigestible, greasy and cold food. 2) belching, which is caused by a large amount of food remaining in the gastrointestinal tract and producing a lot of gas from the mouth during digestion. 3) nausea and vomiting, which is also caused by the retention of such food in the gastrointestinal tract, resulting in gastrointestinal tract dysfunction, resulting in decreased appetite, nausea and, in severe cases, vomiting. 4, infants and children with food accumulation will appear crying and restless, poor spirit and refusal of milk, mainly due to abdominal distention and pain.