Nausea and vomiting and bad breath are mainly caused by indigestion, acute and chronic gastritis, peptic ulcer, advanced gastric cancer, diabetic ketoacidosis, uremia and so on, which need to be treated according to the cause of the disease. 1, indigestion: due to insufficient gastric dynamics, prolongation of gastric emptying time, nausea, vomiting, and even halitosis symptoms; the patient can take gastric dynamics promotion drugs and digestion promotion drugs orally under the guidance of the doctor, such as mosapride, Yeast tablets, stomach-enhancing and eliminating tablets, etc. The usual diet should eat easy to digest fluid diet, such as light noodles, millet porridge and so on. Eat less food that is easy to cause bloating and not easy to digest, such as glutinous rice, chestnuts, sweet potatoes and so on. Eat regularly, eat three meals a day at regular intervals, avoid overeating; 2, acute and chronic gastritis: acute and chronic gastritis patients may appear nausea, vomiting symptoms, vomit is undigested food, for sour odor. Helicobacter pylori examination should be carried out, according to the results of the symptomatic treatment. If the test is positive, aspirin, metronidazole, omeprazole, colloidal bismuth pectin and other drugs can be used for treatment as prescribed by the doctor. If the test is negative, you can follow the doctor’s instructions to apply omeprazole, thioglycollate and other drugs to protect the gastric mucosa treatment. At the same time, life should be regular, avoid overwork and mental stress, quit smoking and alcohol, avoid spicy and stimulating food; 3, peptic ulcer: there can be increased salivary secretion, heartburn, regurgitation, belching, belching, nausea, vomiting and other gastrointestinal symptoms, and then the symptoms of bad breath. Drug-induced peptic ulcers, such as aspirin, should stop using such drugs. For peptic ulcer caused by Helicobacter pylori infection, quadruple therapy can be used to eradicate Helicobacter pylori, i.e. proton pump inhibitor + two kinds of antibiotics + bismuth; 4. Advanced gastric cancer: when the tumor destroys the blood vessels, the patient may have nausea, vomiting, vomiting blood, black stools and other symptoms, and stinky duck-egg halitosis occurs. Laparoscopic or open surgery can be used for treatment, and radiotherapy and chemotherapy need to be used for adjuvant treatment after operation; 5. Diabetic ketoacidosis: the characteristic manifestations are nausea, vomiting, and expiration of rotten-apple smell; early stage patients need to supplement sufficient insulin and liquid, observe the condition closely, check blood sugar and blood ketone regularly, and adjust the dosage of insulin. For patients with acidosis or even coma, immediate resuscitation is needed; 6. Uremia: it can be manifested as lack of appetite, nausea, vomiting, and ammonia odor in the mouth. Alternative therapies are available, mainly hemodialysis, peritoneal dialysis, kidney transplantation and other alternative therapies. In addition to alternative therapies, medication is needed, such as correction of anemia and electrolyte disorders, anti-infection, prevention and treatment of hypertension.