The pain in the anus is jerking for the following reasons: 1. Consider the symptoms of anal sphincter spasm, mostly accompanied by anal fissure performance, which will mainly appear after defecation, the local nerve endings of the anal fissure are stimulated by digestive juices, resulting in severe pain, which subsequently induces anal sphincter spasm jerk-like pain. It can be treated with oral diclofenac sodium extended-release capsules or topical anti-inflammatory pain suppositories, which can have obvious effects, and if necessary, oral antispasmodic drugs to assist in treatment; 2. Pain in the anus is considered to be caused by thrombosed external hemorrhoids, due to varicose veins around the anus, when poor venous circulation forms thrombus, local pain can occur; 3. Anal inflammation, perianal abscess, etc. can also appear pain around the anus, accompanied by redness, swelling, heat, and pain, pain. If you have pain once in a while you can apply local heat, consider the problem is not big, usually ensure smooth bowel movement and avoid prolonged sitting.