Vomiting after pituitary tumor surgery must be judged according to the specific situation. Generally, vomiting within 3 days after pituitary tumor surgery is normal. Because the metabolism of anesthesia and the function of gastrointestinal tract have not been fully recovered, it is normal to vomit. However, if there is still vomiting after 3 days, it is necessary to find out whether it is caused by acute gastroenteritis or intracranial hypertension in the cranium. Vomiting alone is very different from vomiting with other symptoms, such as headache, nausea, vomiting, and vision loss and visual field loss. The most likely cause is intracranial hypertension caused by post-pituitary hemorrhage and compression of the optic nerve. The CT head examination should be completed to clarify the basic changes in the condition, and if there is an increase in bleeding, surgery should be performed again. If not, metoclopramide or granisetron can be used.