Itchy anus after bowel movement may be caused by: fecal residue irritation of the skin, anal fissure and hemorrhoids and other reasons. Itchy anus should not be excessive scratching, to avoid damage caused by bacterial infection, long time itching anus need to go to the regular hospital in a timely manner. After the stool is not cleaned completely, fecal residues stimulate the local mucous membrane skin of the anus, long-term so may form perianal skin disease, such as perianal eczema, perianal papules, etc., can cause anal itching. Anal fissure patients due to anal skin ulcerated surface, fecal residue and intestinal secretion after defecation contaminated to the local, stimulation may lead to anal itching. Hemorrhoid patients after defecation, there may be perianal local mucosal congestion and swelling, thus stimulating the perianal skin to produce itching and other discomfort. If you always feel anal itching after defecation, you need to go to the regular hospital in time to seek professional medical help and give solution as soon as possible to avoid triggering other diseases.