Hidden pain and swelling below the heart may be caused by angina pectoris, overexertion or gastroesophageal reflux disease. 1. Angina: The presence of coronary atherosclerosis in the heart area of the patient will lead to ischemia, which can easily cause angina. During the attack of the disease, the patient is prone to the symptoms of vague pain and swelling below the heart. 2. Excessive fatigue: patients engaged in heavy physical labor for a long time will lead to excessive physical exertion, may cause muscle strain, which is also prone to trigger the performance of hidden pain and swelling below the heart. 3. Gastroesophageal Reflux Disease (GERD): GERD can easily cause stomach contents to reflux into the esophagus, which can easily irritate the esophageal mucous membrane and lead to the symptoms mentioned above. Patients with vague pain and swelling below the heart socket should go to the hospital in time for treatment according to the cause of the disease, which will help stabilize the condition and relieve the above symptoms.