Hello! Thank you for the query. Blood and mucus in the stool is very neglecting symptom and should be checked. It might not be associated with your gallbladder surgery. If it is fresh bright blood on the surface of the stool, hemorrhoids are the most probable reason of it. Otherwise, any other large intestine disease like polyps or even cancer can be a reason. In some cases after gallbladder surgery there are some stones left in the bile ducts or pancreas ducts causing such pains or even acute pancreatitis. Peptic ulcers and severe bacterial infection should be also ruled out. I suggest you to have abdominal ultrasound, full blood work, liver tests (AST,ALT,GGTP,AP), amylase, urine amylase, bilirubin, urine analysis, stool tests performed. If no findings, colonoscopy and upper GI endoscopy should be also done. Hope this will help. Regards.