Diagnostic Criteria for Functional Defecation Disorder: 1. The patient must meet the diagnostic criteria for functional constipation. 2. 2. At least two of the following are present during repeated forceful defecation: (1) Evidence of impaired defecation function on balloon forcing test or imaging. (2) Abnormal contraction of the pelvic floor muscles (e.g., anal sphincter or puborectalis) on anorectal manometry, imaging, or EMG, or anal sphincter relaxation of less than 20% of the resting state. (3) Inadequate peristalsis on anorectal manometry or imaging evaluation. Symptomatic episodes in the last 3 of at least 6 months prior to diagnosis. Functional constipation diagnostic criteria: 1, should include two or more of the following symptoms: (1) at least 25% of the defecation with struggle; (2) at least 25% of the defecation for hard fecal matter; (3) at least 25% of the defecation with incomplete emptying sensation; (4) at least 25% of the defecation with anorectal obstruction sensation; (5) at least 25% of the defecation with the need to assist in the defecation (eg, fingers defecate, support pelvic floor); (6) less than 3 times per week. (6) Less than 3 bowel movements per week. Soft stools without laxatives are rare. 3. Does not meet the diagnostic criteria for IBS. Diagnostic criteria for defecation coordination disorder: 1. Abnormal contraction of the pelvic floor or relaxation of the anal sphincter during defecation is less than 20% of the resting state, and peristaltic force is normal. 2, Diagnostic criteria for defecation peristalsis insufficiency. 3.Insufficient peristalsis during defecation with or without abnormal contractions or anal sphincter relaxation <20%. Epidemiology The prevalence of functional defecation disorders in the general population is unknown, and the prevalence of defecation coordination disorders among patients with chronic constipation seen at tertiary care centers is highly variable, ranging from 20% to 81%. The prevalence of defecation coordination disorders has been overestimated due to the high false positive rate in some studies. This may be partly the result of patients having anxiety and not being able to relax during manual and laboratory tests. In a tertiary care center, defecation coordination disorder was three times more common in women than in men. However, the prevalence was similar in younger and older age groups.