Mucus from the anus without stool can happen when the rectum or lower bowel produces extra mucus. A small amount of mucus can be normal, but repeated or noticeable discharge may be linked to irritation, inflammation, infection, or a structural problem in the rectum.
Possible causes include proctitis, inflammatory bowel disease, irritable bowel syndrome, intestinal infection, hemorrhoids, anal fissures, rectal prolapse, or solitary rectal ulcer syndrome. In some cases, anorectal discharge can also occur with sexually transmitted infections that affect the rectum, especially if there is pain, pus, bleeding, or recent exposure risk.
It is more concerning if the mucus is persistent, bloody, foul-smelling, or comes with rectal pain, diarrhea, constipation, weight loss, fever, a change in bowel habits, or trouble controlling leakage. Doctors may consider stool testing, rectal exam, sigmoidoscopy, colonoscopy, or imaging depending on symptoms.
Avoid using antibiotics, laxatives, enemas, or hemorrhoid treatments without medical advice, since the cause can vary. A gastroenterologist or colorectal specialist is appropriate if the symptom continues or comes with warning signs.