The anal mucus may be a little yellow due to the following conditions: 1, due to the inflammatory infection of anal fissure, inflammatory fluid exudation, so that the anal mucus is yellow. 2, due to the sequelae after doing perianal surgery, that is, the post-operative anal fluid overflow. 3, anal eczema, scratching after the local skin ulceration, infection, inflammatory overflow, etc., resulting in anal anal mucus yellowing. 4, rectal prolapse caused by, in particular, the anal sphincter muscle weakness symptoms, so that the whole rectum or mucosa out of the anus, rectal mucosa and rectal mucus outflow, mucus makes the anal opening secretions increased and yellow. Once this symptom appears, patients must pay attention to it, it is best to go to the hospital for further examination, clear cause and then timely treatment.