Brown stool withyellow discoloration in lines on the surface, yeast or mucus, no pain, gas, diarrhea or constipation, no foul smell, what is this?

Mucus on stool: Mucus discharge occurs in up to 50% of patients with Irritable Bowel Syndrome, with or without pain. Mucus may also be produced in response to partial obstruction, chronic constipation, rectal dysfunction, infection, & even from secretory villous tumors of the rectum. At the very least stool studies & probably a sigmoidoscopy should be considered, but a more extensive evaluation may be warranted.