There are many reasons for nausea and vomiting as soon as you eat, such as digestive system diseases, pregnancy, and adverse reactions after taking medications. 1. Digestive system diseases: when there are digestive system lesions, such as acute enteritis, acute gastritis, functional dyspepsia, etc., there will be the symptom of loss of appetite, and vomiting as soon as you eat something. There are also some patients with obvious correlation with emotions, in the presence of stress, anxiety and other conditions such as abdominal bloating, early satiety and nausea and vomiting performance, may be related to emotional factors on the gastrointestinal tract neuromodulation. 2. Pregnancy: women will have nausea and vomiting when eating during pregnancy, which is the reaction of early pregnancy, it is recommended to consult the doctor to take some anti-emetic drugs, such as vitamin B6. 3. Adverse reactions after taking drugs: patients taking roxithromycin capsules, ibuprofen capsules and other drugs, easy to have adverse reactions, nausea, vomiting and other symptoms. Can follow the doctor’s advice to change or stop using the drug. Nausea and vomiting as soon as you eat, it is recommended to rest for a period of time, if the condition is serious, you need to seek immediate medical attention.