

The Urge to Poop But Only Mucus Comes out (Proctitis): Causes Explained.
The severe urgency to poop with only mucus coming out is usually a sign of proctitis (rectal inflammation). The common causes of proctitis are dysentery, Sexually-transmitted diseases of the anorectal canal, Inflammatory bowel diseases (IBD), anal fissures, and inflamed hemorrhoids.