Morning brushing is always nausea, dry vomiting, this phenomenon is relatively common, usually with the wrong way to brush teeth, chronic pharyngitis, rhinitis, gastrointestinal diseases and other factors, the specific reasons are as follows: 1, the wrong way to brush teeth: too deep in the throat when brushing, or too much foam of toothpaste, may lead to pharyngeal discomfort, especially some people themselves pharyngeal reflex is more sensitive, at this time it is easy to appear nausea, dry vomiting symptoms; 2, chronic pharyngitis: chronic pharyngitis patients generally pharyngeal reflex is more sensitive to external stimuli are also relatively obvious, so in the brushing of the throat, resulting in nausea, dry vomiting. 2, chronic pharyngitis: chronic pharyngitis patients are generally more sensitive pharyngeal reflex, the reaction to external stimuli is relatively obvious, so it is easy to stimulate the throat when brushing teeth, resulting in nausea, dry vomiting, etc.; 3, rhinitis: especially chronic rhinitis and sinusitis patients, often have purulent mucous secretions reflux to the oropharynx, such patients often have nausea, dry vomiting feeling, especially when brushing teeth; 4 Gingivitis: gingivitis patients are prone to bleeding from daily brushing, and if they are more sensitive to the smell of blood, they are prone to nausea, dry vomiting reaction; 5, gastrointestinal diseases: such as gastritis, gastroesophageal reflux disease, etc., often appear acid reflux phenomenon, which causes some stimulation of the throat, resulting in congestion and edema of the throat mucosa, which can cause nausea, dry vomiting symptoms when patients brush their teeth. If you have nausea and dry vomiting when brushing your teeth in the morning, you can go to the hospital for nasopharyngoscopy and laryngoscopy to check whether there is inflammation and foreign body in the throat and pharynx. If there is no abnormal manifestation, nausea and dry vomiting always do not relieve, even during daily eating and rest, and women who have had unprotected sex recently, early pregnancy should also be excluded.