Bladder cysts, also known as bladder diverticula, are caused by holding urine in the bladder for a long time, and the presence of various urinary tract obstruction factors, such as male prostatic hyperplasia or urethral stricture and other diseases, can cause poor urination, and more urine will be stored in the bladder, which is difficult to empty, so the long storage of urine will cause the small room trabeculae in the bladder to rise, and the small room trabeculae in the bladder are increased in the shape of a tic-tac-toe, and the mucosa in the middle of the tic-tac-toe The mucosa in the middle of the tic-tac-toe lattice protrudes outward to form a bladder diverticulum, which becomes a lesion similar to a cystic bladder, but it is not a cystic bladder growth, which is filled with unvoided urine. For bladder cysts further cystoscopy and urodynamics are needed to assess the contractility of the bladder. For larger cysts that interfere with the patient’s urination, surgical excision needs to be considered, which restores the integrity of the bladder and will not produce conscious symptoms. Treatment should be accompanied by relief of obstructive urinary tract disease, which can also cause recurrence of the disease.