What does a white fluid like musus passed by a uc patient mean?

Mucous: The inflamed colon inside layer secretes mucous in excess of usual amount. Usually this mucous is incorporated in the stool. If the rectum is inflamed, the mucous may come out without stool. It is not dangerous. Perhaps the anti-inflammatory medicine should be increased.

Injured lining: Ulcerative colitis attacks the lining of the rectum and colon, causing ulcers that weep into the rectal channel. As the lining heals with therapy the mucus leakage is reduced in amount and frequency.