The presence of a burr in the bladder can be caused by the presence of early tumors as well as inflammation, stones and tuberculosis. 1. Inflammation: The bladder burr sign is usually detected on ultrasound. This is usually a sign that the patient has some bladder disease. Bladder inflammation can lead to damage to the epithelial cells of the bladder. The bladder epithelial cells are congested and edematous, and after fibrous repair, the burr sign may appear. 2. Tumor: there may also be early urological malignancy, due to the destruction of normal bladder epithelial cells by tumor cells. Infiltration into the smooth muscle layer for fibrous repair can appear burr sign. 3. Stones and tuberculosis: Mycobacterium tuberculosis and stones can damage bladder epithelial cells, which can lead to bladder epithelial cell repair burr sign. Bladder burr sign may also be caused by other factors, for this case, we recommend that patients go to the regular hospital in time for treatment, and strive for early recovery.