Signs that your bladder is not completely emptying include:
feeling that you need to strain to pass urine
§ a weak or slow urine stream
§ feeling as if your bladder is not empty even after use of the toilet
§ little or no warning signs when you need to pass urine
§ passing urine while asleep
§ frequent urinary tract infections or cystitis,
§ dribbling’ more urine after visiting the toilet. See your doctor if you experience either of these issues.