What is the cause of occasional pain in the back of the heart

The pain is caused by cholecystitis, duodenal ulcer, coronary atherosclerotic heart disease, etc. The details are as follows:

cholecystitis, the main pain site is the right upper abdomen, but in some severe cases, inflammation may involve the right diaphragm and phrenic nerve, which may cause pain in the right shoulder and back. In patients with duodenal ulcer, if the ulcer is located in the posterior wall of the duodenum, it may cause pain in the posterior heart. In addition, coronary atherosclerotic heart disease pain may also radiate to the posterior heart when it is severe, which is generally caused by insufficient blood supply to the right coronary artery.