How Should Rectal Bleeding Along With Abdominal Pain Be Diagnosed And Treated When It Is Not Hemorrhoids?

Hi, i was concerned about my brother so i was doing some research. He has been experiencing rectal bleeding only in the morning when he first wakes up to go to the bath room and not every day. his doctor put him on stool softeners and also tested the stool but the doctor said there was no blood or hemorrhoids in the stool. this bleeding on accrues when he first wakes up and goes to the bathroom and has a bowel movement. When he has abdominal pain he knows to expect to see blood.