For male patients, if there is a burst of stabbing pain in the left side of the chest: 1. First, consider the pain caused by intercostal neuralgia or herpes zoster, which usually does not have other accompanying symptoms such as obvious chest tightness and shortness of breath. 2. If a trauma causes a fracture of the sternum or ribs, there will also be pain in cases of contusions and lacerations of the surrounding soft tissues. 3. For some inflammatory diseases of the respiratory system, such as left pleural effusion, pleurisy, and lung infection, there will also be the above-mentioned conditions. 4. For patients with a previous history of coronary heart disease, unstable angina or acute coronary syndrome should be considered. 5. For some patients who overeat, smoke, or drink a lot of alcohol, there will also be the above-mentioned manifestations if acute pancreatitis occurs.