Dry heaving in the morning when brushing teeth may be caused by gastric cancer, but it is not absolute, it may also be caused by other diseases, which needs specific analysis. Some patients have a sensitive pharyngeal reflex, so when the toothbrush reaches too deep, dry vomiting will occur, which is a normal physiological phenomenon and requires no special treatment. Patients with chronic pharyngitis, daily or brush teeth can feel discomfort in the throat, such as throat dryness, itching, swelling, easy to dry vomiting, foreign body feeling, coughing, swallowing, mostly after eating irritating food, fatigue or weather changes aggravated, you can follow medical advice to use the pharyngeal medication, such as pharyngeal pill, symptoms can gradually improve. However, if the patient has dry vomiting, accompanied by epigastric discomfort, fullness after eating, loss of appetite, belching, weakness and other symptoms, it is highly suspected to be gastrointestinal disease or even gastric cancer, and should be promptly admitted to hospital for gastroscopy to clarify the diagnosis and early treatment. In daily life, we should drink more water, choose a light and easy-to-digest diet, avoid stimulating food, tobacco, alcohol and strong tea, and take regular rest and rest.