Nausea and vomiting from brushing teeth in early pregnancy may be due to the reaction of early pregnancy. Early pregnancy may cause nausea, vomiting and weakness of limbs because of the difference in individual’s constitution, which may lead to a particularly sensitive gag reflex, which will aggravate the above-mentioned symptoms when stimulated by brushing teeth, and generally speaking, no special treatment is needed. If the symptoms of nausea and vomiting are particularly pronounced and affect your health, it is recommended to visit the obstetrics department. In addition to this, it may also be caused by chronic pharyngitis, which cannot be cured and can only be relieved by medication, but many medications cannot be used in the early stages of pregnancy and have certain side effects and teratogenic risks. It is recommended to eat a light diet, avoid spicy and stimulating foods, eat more vegetables and fruits, and ensure sufficient sleep to improve the body’s immunity.