K.E.
My daughter, who is 8, had this happen this time last year. We took her to the doctor who did some tests and scheduled us to see a GI who did some tests all of which came back negative. They then did a colonoscopy/endoscopy and found that she had an irritated colon. She was put on medication for 3 months and has been fine ever since. She, too, had no other symptons but blood and mucous in her stool. She is totally fine today.