The sympathetic nervous system, which helps your heart and other vital organs function all the time, increases activity in response to danger or stress, preparing the body for extra demands.

"A dysregulated nervous system is defined as where the balance between the sympathetic ("fight or ... the hypothalamic-pituitary-adrenal (HPA) axis, leading to elevated cortisol levels that ...

Introduction The pathophysiology of tendon pain is not fully understood, although preliminary data indicates involvement of the sympathetic nervous system (SNS). Large prospective studies identify ...