Persistent abdominal pain can not find out the cause of how to do

You can first go to the hospital to do blood routine, B ultrasound, stool routine, liver function tests, etc., if there is no obvious abnormality, or there is no specific index, you need to consider tuberculosis or cancer pain. You can then do tuberculosis, tumor markers, ct and other tests. You can also do serum amylase test to determine whether it is pancreatitis.