Abstract: A system and method for treating a medical condition of a subject and an apparatus for treating a medical condition of a subject by applying electrical stimulation to a target peripheral nerve. The apparatus includes a plurality of electrical stimulation electrodes are spaced from each other in a predetermined configuration and one or more recording electrodes. A wearable structure supports the stimulation electrodes and the recording electrodes spaced apart from each other. A control unit controls the operation of the stimulation electrodes and the recording electrodes. The control unit is configured to energize the stimulation electrodes to apply stimulation to a tibial nerve and record physiological response using the recording electrodes. The control unit is also configured to automatically detect the foot, right or left, upon which the apparatus is worn by monitoring a phase relationship or time delay between applying stimulation to the tibial nerve and recording the physiological response.