Examples are disclosed herein that are related to monitoring body hydration levels based on galvanic skin response measurements acquired by a wearable electronic device. One example provides a wearable electronic device including a sensor configured to measure a galvanic skin response, a logic device, and a storage device including instructions executable by the logic device to operate a hydration monitoring mode, acquire a plurality of measures of galvanic skin response over time, present data regarding the plurality of measures of galvanic skin response.
