Hello and Welcome to ‘Ask A Doctor’ service. I have reviewed your query and here is my advice. No, this type of surgery should not cause blood in stool and diarrhea. In most cases, causes of abdominal pain and bleeding through rectum are benign and include hemorrhoids, anal fissure or rectal polyps. These are primarily treated with stool softener, diet and sitzbaths. It is very important to take lot of fluids, probiotics, high fibre food and stool softeners to avoid hard stool and straining. If there is no improvement in next few weeks, then surgical management should be considered. Other causes may be more serious and include tumors or inflammatory bowel diseases and these should be ruled out with colonoscopy which must be done if there is low blood count present or rapid weight loss. Otherwise, you can see if conservative therapy will help and consult proctologist if necessary. Hope I have answered your query. Let me know if I can assist you further.