There are three main possibilities for anal water: first, physiological factors, when a violent cough or constipation, due to the increase in intra-abdominal pressure, can make the rectum mucus flow to the outside of the anus, the phenomenon of anal water, this is a normal physiological changes, may not be special treatment. Second, hemorrhoids, when the nucleus is embedded and formed thrombosed external hemorrhoids, due to hemorrhoidal vein stasis, expansion, resulting in tissue fluid extravasation, can also appear the phenomenon of anal water, this is often accompanied by severe anal pain. Thirdly, anal fistula, mostly secondary to perianal abscess, including the internal port, fistula and external port, the typical clinical manifestation is anal pus and fluid flow. In conclusion, do not be overly panic after the appearance of anal water, should be timely to the regular hospital anorectal surgery or general surgery, and actively cooperate with the treatment of specialist physicians, can be cured, will not cause serious clinical consequences.