Morning brushing nausea and acid vomiting may be caused by digestive system disorders, such as gastritis. Gastritis can usually present with symptoms such as bloating, belching, nausea and vomiting. It may be caused by the usual inattention to diet, and can be treated with oral medications such as gastric mucosal protectants and acid suppressants. It may be caused by pharyngitis, tonsillitis, periodontitis, etc. can cause nausea and vomiting from brushing teeth. If it is caused by chronic pharyngitis, you can take oral medications such as Niuhuang detoxification tablets and Pu Di Lan oral solution. It is also possible that the vomiting reflex is caused by the toothbrush touching the back wall of the pharynx when brushing teeth, try not to stuff the toothbrush too much when brushing teeth. You should also pay more attention to rest, replenish water, eat less spicy and stimulating food, and exercise properly.