If the volume of urination is less than 100ml or more than 500ml, there are abnormalities and we recommend further examination at the hospital. If a single urination is less than 100ml, it is most likely to be caused by urinary tract infection or overactive bladder, which is usually accompanied by symptoms such as urinary urgency or a feeling of incomplete urination. If a single urination exceeds 500 ml, the presence of reduced bladder sensitivity is considered to be a common cause of neurogenic bladder due to type 2 diabetes, or the presence of bladder diverticulum, prostatic hyperplasia, spinal cord injury, etc. Under normal circumstances, the initial bladder volume is 150ml, which means that when you feel urine in the bladder, but at this time you can still hold the urine volume for a while, which is about 150ml. When the amount of urine held is close to 250-300ml, then a strong desire to urinate can arise, so the amount of urine that a person can urinate at one time is about 150-250ml.