My mother operated on malignant colon tumor half a month ago. At first, I went to eat porridge for about 4.5 days, then switched to rice, but ate all vegetarian food. About 3 days ago, she ate little and had difficulty defecation. The pain in the abdomen is tingling and then it goes away, the pain lasts a few minutes, but it repeats. So the doctor asked me to eat less with difficult bowel movements after surgery for malignant colon tumor?