The main reasons for anal numbness are the following: 1, the protrusion of the lumbar discs compressing the local nerves, or the sacrococcygeal nerves after being compressed by the discs, causing symptoms of abnormal stimulation of the nerves at the anal opening. 2, mainly because of regular sedentary or standing, resulting in symptoms of compression of the sciatic nerve caused by anal numbness. 3, mainly because the usual nutrition is not perfect, or local vitamins are not adequately replenished, resulting in The nerve near the anus is not nourished, and the nerve atrophy causes the symptoms of the anal opening. 4, because of bacterial infection near the anus, which leads to perianal abscess, anal fistula, rectal mucosal lesions and other diseases, can cause purulent changes in the soft tissues and tissue spaces around the rectal mucosa, thus invading the nerves around the anus and causing the symptoms.