One aspect of the present disclosure relates to a closed-loop therapy system for treating post-traumatic stress disorder (PTSD) in a subject. The therapy delivery system can include a sensing component, a delivery component, and a controller. The sensing component can be configured to detect at least one physiological parameter associated with PTSD. The delivery component can be configured for implantation on or about a ganglion of the sympathetic nervous system (SNS). The controller can be configured to automatically coordinate operation of the sensing and delivery components. The controller can also be configured to deliver an electrical signal to the delivery component so that activity of the ganglion of the SNS is substantially blocked without enhancing a symptom of PTSD.
