Blood in stool is something VERY serious and can mean cancer. See a doctor right away and don't be afraid to tell the doctor what you posted here....it vould save your life.
you could have ulcers and hemorrhoids from being constipated and straining to much which would also cause you to see some blood
Either way when you have bleeding from the rectum you should have the evaluated by a dr to make sure there is nothing serious going on
Do you have peptic ulcers????????????