There are many reasons for anal pain in the toilet: First, consider anal fissure, the main cause of anal fissure is dry stool, or dry and hard head of stool, which tears the mucous membrane of the anus or anal canal, resulting in anal pain, which is manifested by anal pain, bleeding stool, pain is obvious when defecating, and pain will gradually reduce after stooling. Second, consider the diagnosis of inflammatory external hemorrhoid or thrombosed external hemorrhoid, which is mainly caused by dry stool or diarrhea, constipation, prolonged sitting, prolonged squatting resulting in edema of the anal skin and the accumulation of thrombus formed by the rupture of blood vessels below, which is hard when pressed and has a texture like the hardness of the tip of the nose. Third, the diagnosis is perianal abscess, showing redness, swelling, heat and pain in the perianal area, and if there is a fluctuating feeling on the surface of pus formation, perianal ultrasound can make a clear diagnosis.