What causes pain under the left sternum

For patients who show dull pain under the left sternum, it is first seen in stomach diseases, especially gastritis, gastric ulcer or stomach tumor, which will cause dull pain under the left sternum accompanied by abdominal distension, belching and acid reflux. There are also diseases of spleen, such as splenomegaly, splenic tumor and cyst, which will also cause dull pain under the right sternum. There are also diseases seen in the pancreas, such as pancreatitis, pancreatic tumors, and early pain below the left sternum. After this situation, it is necessary to perform an examination of the stomach and spleen and pancreas to see what causes the pain, and to treat the etiological system.