The inability to pull out stool due to anal weakness is usually due to the following possibilities: 1. Consider that it is due to anal diseases such as hemorrhoids, which cause the sphincter of the anus to over-expand and cause relaxation, or due to the patient’s relatively old age and muscle atrophy. 2. Anal spasm, which is due to the muscles of the anal area, such as the anal sphincter contracting for a longer period of time after being stimulated by the outside world, resulting in the relative narrowing of the anus and the inability to This is due to the fact that the anal area muscles, such as the anal sphincter, contract for a longer period of time after being stimulated by the outside world, resulting in the relative narrowing of the anus and the inability to pass stool. 3, weak rectal contraction and weak transmission function are mostly seen in patients with weak constitution or chronic constipation, in most cases with pathological changes in the colorectal innervation nerve fibers. 4, there may also be anal neurological injury resulting in damage to the spinal nerve or infection, triggering a decrease in the function of the anal sphincter.