There are four possibilities: first, prolapse, that is, prolapse of rectal mucosa. When prolapse is incomplete, mucus in the rectum may leak to the outside of the anus with the prolapsed rectal mucosa, resulting in the phenomenon of anal water. The second, hemorrhoids, hemorrhoids can be divided into internal, external and mixed hemorrhoids, when the hemorrhoids prolapse to the outside of the anus, there can be part of the liquid out of the anus. Third, anal fistula, often secondary to purulent infection of the perirectal space, consists of three parts: the internal port, the external port and the fistula, the mucus in the rectum can flow through the fistula through the internal port and finally flow from the external port to the outside of the anus. Fourth, malignant tumors of the rectum and anal canal, due to the increased growth rate of tumors will appear increased mucus secretion, causing increased anal discharge. Therefore, when you find that the anal discharge increases, you should promptly go to the regular hospital for anal finger examination or fiberoptic colonoscopy in the anorectal surgery or general surgery to make a clear diagnosis and carry out reasonable treatment under the guidance of a specialist.