There are two main reasons to consider that there is always stool in the anus. First, anal sphincter relaxation can occur when anal trauma or spinal pathology can cause anal sphincter contractile dysfunction. When coughing or exercising due to the increase of intra-abdominal pressure, the phenomenon of having stool in the anus can occur. Secondly, anal fistula, mostly secondary to rectal perianal abscess, is mainly composed of three parts: inner mouth, fistula and outer mouth. Feces can pass through the inner mouth through the fistula, and finally discharged by the outer mouth, thus appearing the phenomenon of anal leakage of stool. In conclusion, when there is always stool in the anus, you should go to the regular hospital anorectal surgery or general surgery department in time, to clarify the reason why there is always stool in the anus, and decide whether to carry out surgical treatment after a full assessment by a specialist. In daily life, you should wash your anus in a timely manner after defecation to keep the anus locally clean and avoid perianal infections and chronic eczema.