Pulling a stool does not hurt, after a few hours the anus began to hurt, usually the first to consider the anal fissure caused by, can also be seen in the mixed hemorrhoids, anal fistula and other diseases. 1. Anal fissure: It is the cracking of the mucous membrane tissue on the surface of the anal canal at the exit of the digestive tract. Generally due to long-term constipation, the bowel movement difficulties caused by dryness, resulting in the mucous membrane of the anal canal long-term friction, and the emergence of ulcers, and ultimately lead to anal fissure. Generally, the pain after anal fissure is the spasm of anal sphincter muscle after anal defecation, and there is severe pain. 2. Mixed hemorrhoids: due to long-term sedentary, increased intra-abdominal pressure disease, constipation and other diseases, resulting in blood circulation around the anus is impeded and the emergence of mixed hemorrhoids. When mixed hemorrhoids appear, if there is difficulty in defecation, after defecation, the anal sphincter muscle intense contraction, resulting in pain. 3. anal fistula: various reasons lead to repeated infection of mucous membrane tissue around the anus, damage and ulceration, and ultimately the formation of sinus tracts, and produce anal fistula. After the fistula, fecal fluid, a small amount of fecal fluid into the sinus tract, easy to cause mucosal irritation and pain in the sinus tract after defecation. If the above situation, it is recommended that patients go to the hospital in a timely manner, to clarify the cause of the disease, to give reasonable standardized treatment, so as not to delay the condition.