The symptoms of vomiting after eating mulberry are mainly considered to be caused by allergic gastroenteritis. This is because patients with this condition, once consumed allergenic food will cause the human immune system to have a non-specific metamorphosis, and lead to hyperfunction of the stomach, intestines and other digestive tract tissues and absorption disorders. The contents of the gastrointestinal tract may reflux into the chest and esophagus due to continuous contraction and spasm of the smooth muscle. The local mucosal tissues are subjected to high permeability of acidic substances such as gastric acid and bile, causing reflex nausea and vomiting. Some patients may have complicating symptoms such as fever, malaise, itching, and watery diarrhea, and the possibility of other types of diseases, such as acute gastroenteritis, adenoviral enteritis, and bacterial dysentery, cannot be excluded.