Abstract: A device and method for monitoring condition of the patient's bladder urine distention level are presented. The device comprises a sensing unit and an indication unit. The sensing unit is attachable to a certain location on the patient's abdominal, and is of a kind transmitting acoustic signals substantially not exceeding 20 kHz to the urine bladder through tissue, receiving signals reflected from the urine bladder, and generating data representative of the condition of the bladder urine distention. A processor is interconnected between the sensing and the indication units. The processor is responsive to the generated data for analyzing the same and selectively generating a signal indicative of the existence of a predetermined condition of the patient's bladder urine distention level.