Occupational lesions of the bladder are tumors that grow inside the bladder. Normally, the inner wall of the bladder is smooth and consists of the mucous membrane of the bladder, but long-term inflammation can lead to atypical hyperplasia of the mucous membrane, or even carcinoma, resulting in occupational changes. If the cancerous tissue progressively increases in size, it develops into a space-occupying lesion of the bladder. Of course, besides bladder cancer, there are also sarcoma of bladder and benign bladder lesions, which can also appear as occupying lesions. The specific difference is that if cancer cells or sarcoma cells are found under cystoscopy, it can be malignant occupying lesions.