The intestines are congested and there is no erosion. Biopsy is needed if intestinal polyps, roughness of the intestinal mucosa, etc. are found. Biopsy, short for biopsy, is the surgical method of excision, clamping, scratching, coarse needle puncture and other surgical methods to obtain diseased tissue from the living body, and routinely fixed so that it maintains the original appearance of the lesion. Can also be intraoperative fresh tissue rapid freezing, and then made into slides, pathologists usually use a microscope to observe the tissue morphology, if necessary, with the help of special staining, immunohistochemical staining gene detection and other ancillary technologies, to make a pathological diagnosis of the process. Intestinal congestion, if a local inflammatory reaction occurs, the presence of mucosal roughness; found polyps; the presence of mucosal vascular hyperplasia, glandular duct abnormalities, lymphoid follicular hyperplasia; previous history of ulcerative colitis, Crohn’s disease, pseudomembranous enterocolitis and other medical history of patients, it is recommended to seek medical attention in time, such as pathological biopsy in order to clarify the diagnosis, and under the guidance of the doctor to carry out targeted treatment.