Abstract: The invention described herein provides for a portable autonomic nerve system stimulation device that may operate as an “open-loop” or “closed-loop” stimulation system and includes in some embodiments a paired therapy for a disease or condition. Embodiments of the inventive device include at least one stimulation circuit for the generation and delivery of a stimulation, at least one biological signal monitoring apparatus for monitoring a biological state of a user wearing the device, at least one controller in electrical communication with the stimulation circuit and at least one power supply for providing power to the controller and stimulation circuit. Aspects of the invention provides for a portable autonomic nerve system stimulation device which may be worn in the ear, or about the head, of a subject, patient or user.