When a child is 9 years old and vomits several times, it may be caused by acute gastroenteritis, appendicitis and other diseases. It can be treated by general treatment, medication, surgery and other means. 1. Acute gastroenteritis: usually there will be more obvious vomiting, accompanied by abdominal pain, abdominal distension, increased frequency of stools and so on. At this time, you can use montelukast to protect the gastrointestinal tract, and use probiotics and other drugs to regulate the intestinal tract, and if necessary, you can use oral rehydration salts to replenish electrolytes and water, so as not to cause water-electrolyte disorders. 2. Acute appendicitis: children can vomit, and will be accompanied by metastatic pain in the right lower abdomen, some children will be due to pus in the appendix, irritation of the intestine, resulting in increased stool frequency. Appendicitis needs to be treated with antibiotics such as penicillin and other antibiotics, and when high fever is present, ibuprofen suspension can also be used to reduce the fever, and if necessary, the appendix needs to be surgically removed. The child is nine years old, vomited several times, there may be intestinal obstruction, trauma and other causes, it is recommended that timely medical care, identify the cause, with the doctor to carry out treatment.