Why would my diarrhea be clear with small crystals in it? i am 200 lbs i am 30 years old no medical problems

Mucoid 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.