Efficacy Observation of Kangfuxin Liquid via Anal Irrigation in the Treatment of Low Anterior Resection Syndrome

INTERVENTION: Control group:Clean water enema;Experimental group:Kangfuxin Liquid enema; CONDITION: Low Anterior Resection Syndrome (LARS) PRIMARY OUTCOME: Low Anterior Resection Syndrome Score; SECONDARY OUTCOME: European Organization for Research and Treatment of Cancer Quality of Life Questionnaire Core 30 Score; INCLUSION CRITERIA: 1. Age between 18 and 80 years old; 2. Preoperative clinical diagnosis of low rectal cancer; 3. During surgery, the lower edge of the tumor is <=7 cm from the anal verge; 4. Successfully completed low anterior resection for rectal cancer with sphincter preservation; 5. Developed low anterior resection syndrome after surgery, with a LARS score >=21 one month post‐op after first‐line treatment; 6. Patient has good communication skills, can sign the informed consent form, is willing to follow up, and has completed at least 6 months of follow‐up.