The residual urine volume of 111 ml in the bladder belongs to the increased residual urine volume, and the main causes include prostatic hyperplasia, bladder stones, bladder tumors, abnormal function of bladder forcing muscle, neurogenic bladder and so on. 1. Prostatic hyperplasia: It is a common urinary tract obstruction factor that occurs in men. The hyperplasia of the prostate gland compresses the urethra and affects the urination condition, causing a large amount of residual urine. 2. Bladder stones: Bladder stones cause obstruction to the urinary tract, which will also cause abnormal urination and increase the amount of residual urine, and will be accompanied by symptoms of bladder irritation. 3. Bladder tumor: It is also one of the causes of obstruction, and also affects the contraction of the bladder, leading to an increase in residual urine volume and hematuria. 4. Abnormal function of forced urinary muscle of bladder: trauma, inflammation, nerve injury and other reasons can lead to abnormal function of forced urinary muscle of bladder, which affects the urination condition and leads to increase of residual urine volume. 5. Neurogenic bladder: It is closely related to the chronic injury of spinal cord, which will affect the nerve function and cause the bladder function to be weakened, leading to the increase of residual urine volume. There may be other reasons for the increase in residual urine volume, which require timely medical observation and treatment under the guidance of the clinician.