I have often seen the claim that cortisol mediates stress. But mine and other's clinical (and scientific) experience shows, that this hormone on the contrary, suppresses harmful stress changes in the body. The body in unusual (stressful) conditions has the ability to "fine tune" due to cortisol. That means, that cortisol repays (much reduce) all reactions in the body, except those, which are directly aimed at solving the problem.
Depletion of cortisol indicates, that the stress is too strong, and that the body can not keep control of the stress responses. With a lack of cortisol a generalization (considerable redundancy) of certain reactions in the body happens (e.g. inflammatory reactions), which is causing additional stress. However, even in serious scientific journals it is written, that cortisol is a "stress hormone". This statement is misleading. Cortisol - a hormone that "modulates of stress" as a minimum. Maybe someone shares the same view?