Anal fissure well if there is no anal stenosis is not required to expand the anus, if you need to expand the anus can be used with fingers or instruments, such as flared anoscope, anal dilator, physical expansion. General anal fissure surgery is not needed to expand the anus, easy to lead to trauma cracking, as long as the usual diet of coarse fiber food, drink more water to keep the bowel movement can be. If you need to physically expand the anus, it is generally not recommended to deal with it by yourself, but try to go to the hospital to let the professional doctor to do anal expansion surgery, which is divided into the use of fingers or instruments. 1. Finger anal dilation: need to fully lubricate the anus and anal canal, and local anesthesia, into the index finger of both hands into the anus, alternately to both sides of the anal dilation, after the adaptation can be added to the middle finger of both hands, the same cross anal dilation. 2. Instrumental anal dilatation: can be given by a professional doctor using a flared anoscope or anal dilator to dilate the anus, the patient can also be under the guidance of the doctor to use the anal dilatation rod and other self-operation, the first choice of small anal dilatation rod and then gradually thickened, in accordance with the doctor’s instructions. Specifically need to be operated by a professional doctor, follow the doctor’s instructions.