Large bladder tumors are not necessarily malignant lesions, some benign lesions can also have a significant increase in size, the benignity of bladder tumors need to be judged according to pathology. Some of the benign tumors in the bladder can be large in size, such as smooth muscle tumors, inverted papillomas and cysts, etc. The corresponding tumors have smooth edges, uniform density, symptoms of compression on the surrounding tissues, and there are no obvious signs of malignant tumors, and there is no malignant transformation of the cells on further examination. On the whole, it is not necessarily a malignant tumor with increased volume. Even if the tumor in the bladder is benign, we should be vigilant, it may also cause urinary tract obstruction, affecting the urinary status, etc., and should be treated under the guidance of the clinician to avoid the delay of the condition.