... problem is the bleeding. I am always afraid of it being cancer. Also I am constipated all the time. I've done everything possible from eating an almost organic diet, lots of fiber, lots of exercise, lots of drinking water and taking rectal mesalamine.I see my doctor once a year. Is there anything else. Why all the bleeding? My family doctor prescribed zantac 150 mg. Said it would stop the bleeding. Doesn't make any sense to me. Have not taken it