When metastasis to other locations, such as liver and gallbladder or bone metastasis to the spine, stomach pain combined with back pain will occur. 3, heart problems: when myocardial infarction or angina pectoris, it is not easy to distinguish from the location of stomach pain and the reflex pain of heart disease is also in the back, so specific analysis is needed to determine what the disease is by first doing the relevant examination.