Physical examination of the anal region is done to find the cut and the probable cause of the fissure. If a fissure lasts for more than 8 weeks, it is called chronic fissure which can turn severe with time. The doctor can also ask for flexible sigmoidoscopy, where a thin tube is inserted in the bottom part of the colon.
Colonoscopy can also be performed to confirm the fissure. A thin tube is inserted in the rectum to examine the entire colon.