 [ Symptoms ] what type of doctor do i need to diagnose lower abdominal pain  i have had problems with constipation ever since radiation treatments for prostate cancer back in 2004 after these treatments i also experienced a reaction to dairy products which i have since discontinued  i have been dealing with it by using a fiber supplement several times a day something is a little different this time as i have had off and on lower abdominal pain for 3 days now could this be the result of straining too hard for a bm [ Disease ] primary care physician