Abdominal pain, which almost everyone has experienced, is one of the most common symptoms of gastrointestinal disorders. Some people think that abdominal pain is a minor problem that can be tolerated, but sometimes abdominal pain is not that simple. Abdominal pain can be caused by abdominal organ diseases, extra-abdominal diseases and systemic diseases, and there are two kinds of acute abdominal pain and chronic abdominal pain. Acute abdominal pain has a rapid onset and short duration, mostly caused by internal or external abdominal organ diseases, and can be accompanied by nausea and vomiting. Acute abdominal pain is the most common reason for emergency department visits and the most complex clinical symptom, and abdominal pain in the elderly is a sign of serious disease, with life-threatening risks if misdiagnosed and mistreated. Abdominal pain, we usually understand that abdominal pain is a problem with the gastrointestinal tract, liver, gallbladder, pancreas and other organs in the stomach, but in fact, there are also cardiovascular diseases (coronary heart disease, aortic coarctation), gynecological diseases (such as ectopic pregnancy, ovarian torsion), urinary system diseases (such as kidney stones), diabetic ketoacidosis and other poisoning can cause acute or chronic abdominal pain. These acute abdominal pain caused by cardiovascular system diseases are the most dangerous, it is necessary to understand the “fatal acute abdominal pain”, if the following similar performance, do not simply think that abdominal pain is simply a digestive system diseases. 1, myocardial infarction: the most fatal is the abdominal pain caused by acute myocardial infarction, about 8% of the cases of myocardial infarction. In the early stage of heart attack can be manifested as sudden onset of severe pain in the upper abdomen, accompanied by nausea and vomiting, which is very easy to mistake for gastrointestinal diseases or cholecystitis. Therefore, middle-aged and elderly patients with previous history of coronary heart disease and angina pectoris suddenly develop severe upper abdominal pain, and even a few patients can have no history of coronary heart disease, so persistent severe abdominal pain must insist on an electrocardiogram to exclude acute myocardial infarction, and electrocardiogram is the easiest and most effective way to exclude heart attack. 2, angina pectoris: similarly there is angina pectoris may also have abdominal pain. In angina, coronary blood flow decreases, myocardial ischemia, hypoxia, and excessive accumulation of metabolites in the myocardium, such as lactic acid, which stimulates the afferent nerve endings of the autonomic nerves in the heart and produces painful sensations, manifesting as epigastric pain, which often shows activity-related, can be relieved by rest, and a few will show resting epigastric pain, which is easily misdiagnosed as acute gastroenteritis. Because the pain of these diseases are visceral nerve conduction. 3, abdominal aortic aneurysm: usually occurs with a previous history of atherosclerosis. Pulsating masses palpable in the abdomen and low back pain are the most common manifestations of ruptured abdominal aortic aneurysms. CT examination can clarify this. 4, aortic coarctation: sudden onset of severe pain, usually chest pain, but also low back pain and abdominal pain and other manifestations, which may radiate to the lower extremities, the site of aortic coarctation pain can sometimes suggest the site of the tear. Inconsistent pulsation of the radial artery or dorsalis pedis artery bilaterally, significantly weakened or absent pulsation on one side, and a difference in blood pressure of more than 10 mmHg between bilateral limbs are characteristic manifestations of this disease. In middle-aged and elderly patients with preexisting hypertension, persistent tearing abdominal pain with low back pain, along with inconsistent pulsation of bilateral dorsalis pedis arteries, this condition should be especially considered, and most of them need CT examination to further confirm the diagnosis. 5, mesenteric thrombosis: usually also with persistent abdominal pain with nausea and vomiting as the first symptom disproportionate to the signs, pain medication is ineffective, if not treated in time, it will develop into intestinal necrosis or even multi-organ failure and death. Patients with a past medical history of atrial fibrillation who develop the above symptoms should be highly suspected of embolism-induced intestinal necrosis. In addition, the following abdominal pains should be treated as soon as possible: 1. abdominal pain that appears suddenly and is severe and lasts for more than 6 hours indicates that the abdominal pain is not caused by simple gastrointestinal spasm and has no tendency of spontaneous relief, and requires medical attention. 2, abdominal pain with vomiting blood, or dark stools, dark red stools, this is the performance of gastrointestinal bleeding, and the amount is relatively large. 3, abdominal muscle tension, can not be touched, once touched, the pain is severe, this is a typical peritonitis performance, common perforation of the digestive tract, appendicitis perforation, etc. 4, can not defecate, no fart, especially at the same time with vomiting, this is a typical intestinal obstruction, intestinal obstruction performance. 5, abdominal pain and fever, abdominal pain with jaundice, dizziness, fainting, rapid heartbeat, pale face and other situations that cannot be resolved by yourself and cannot be judged, you need to seek medical attention as soon as possible. In summary, abdominal pain is a relatively common disease, if severe and continuous abdominal pain occurs, must not be ignored, especially the combination of cardiovascular disease, dyslipidemia, hyperglycemia friends, must be and to the hospital for examination. The differential diagnosis of acute abdominal pain is not easy, so a comprehensive examination: electrocardiogram, blood routine, blood biochemistry, troponin and abdominal CT examination is necessary, otherwise it is difficult to make a clear diagnosis and further correct treatment.