There are several reasons for the constant nausea and vomiting symptoms after wisdom tooth removal. I. Since the wisdom teeth are located especially close to the pharynx, on the innermost side, there is a small amount of blood flow after extraction, which stimulates the pharynx and produces nausea. Second, after the wisdom tooth is removed, the position of the cotton ball, which is on the inner side, affects swallowing or stimulates the pharynx, resulting in nausea. Third, the anesthetic injection may be injected close to the pharynx, and the reaction of the anesthetic causes the patient to have symptoms of nausea and vomiting. Patients can ask the doctor to make moderate adjustments according to their symptoms. They can adjust the position of the cotton ball, or use a saliva tube to remove the residual blood in the mouth, so as to observe whether there is any reduction.