The patient was diagnosed in a small hospital because of abdominal pain, vomiting, and diarrhea for 1 week: acute gastroenteritis. Cold. The patient was given rehydration, blood pressure, oxygen, and cardiac monitoring and was transferred back to the hospital and admitted to the coronary care unit. This is not the first case of this kind of patient in my emergency work, but all of them have delayed consultation due to gastroenteritis, resulting in serious consequences. According to relevant data, about 30% of patients with acute myocardial infarction can develop gastrointestinal symptoms, which are manifested as frequent nausea, vomiting, epigastric distension and diarrhea. They are mostly seen in the elderly and appear in the middle of the night, and are easily mistaken for acute gastroenteritis or indigestion and sent to the hospital for emergency treatment. According to research, the appearance of these symptoms may be related to the stimulation of the vagus nerve by necrotic myocardium and the rapid decrease in cardiac output and perfusion, which may lead to critical manifestations such as slowed heartbeat and decreased blood pressure. Therefore, elderly people with gastroenteritis symptoms such as abdominal pain or diarrhea in the middle of the night, especially those with pre-existing coronary artery disease, should be highly suspected of having acute inferior myocardial infarction and sent to the hospital for further examination and treatment as soon as possible to avoid delaying the condition and losing the time for resuscitation.