Stomach pain after the booster shot of the new crown vaccine is considered to be due to stomach problems or dietary reasons, which are generally not related to the vaccine. 1. Stomach problems: if there are gastritis, gastric ulcer and other diseases, there may be stomach pain, acid reflux and other symptoms. Generally, they are not related to the vaccination, and most of them have relevant medical history. 2. Lifestyle and dietary reasons: such as eating spicy and irritating food, irregular diet and other reasons can appear stomach pain symptoms, usually remove the triggers, can be recovered. Common adverse reactions after booster vaccination include fatigue, fever, headache, cough, diarrhea, nausea, etc. Generally, there are no symptoms after the first vaccination, and most of them have no adverse reactions after booster vaccination. For the case of stomach pain after receiving the booster shot of the new coronary vaccine, it is recommended to consult a doctor to clarify the cause. It is recommended to consult a doctor to clarify the cause.