If nausea and dry heaving occur in the morning when brushing teeth, and usually do not have such a situation, it may be caused by pregnancy, because after pregnancy the body estrogen increases, which will lead to gastrointestinal mucous membranes have a slight edema, nausea and dry heaving will occur, especially in the morning when brushing teeth more obvious, it is recommended that you can do a morning and early pregnancy test. The vast majority of early and early pregnancy test can know whether the pregnancy, if already pregnant want to continue the pregnancy, it is recommended to obstetrics to do the appropriate examination, if the clinic does not want to continue the pregnancy, you can go to the gynecology department to do the appropriate examination or medication abortion, or to do the artificial abortion. If you do not want to continue the pregnancy, you can go to the gynecology department for appropriate examination or medication abortion or abortion. In addition, if you exclude the possibility of pregnancy, this situation may be caused by gastrointestinal diseases, and it is recommended to go to the gastroenterology department for further examination.