AP, that link you provided does not list pain as a symptom of Cushing's disease. I checked another page on Cushing's, and it too did not suggest that widespread pain was typical of this syndrome that results from too much cortisol (including as a result of long term corticosteroid medication).But I doubt that patients with, say, Cushing's Syndrome - an extreme manifestation of high cortisol, are pain free.
Higher pain than normal causes cortisol levels to increase. I don't think we can reverse that relationship and say that high cortisol levels cause pain. And, therefore, the idea that previous trauma causes a sustained high level of cortisol which causes chronic pain doesn't seem to hold up.
Here's the abstract for that paper:These links suggest that some people who suffer trauma of various kinds may suffer measurable effects on their cortisol levels :... Effect of previous trauma on acute plasma cortisol level following rape
The paper only looks at levels of cortisol immediately after the rape, so it says nothing about long term levels of cortisol. What the paper appears to be saying is that women who had not been assaulted before had higher levels of cortisol immediately after being raped than women who had been assaulted before. That's not surprising. Neither is the fact that it was the women who had a history of previous assault who were more likely to develop PTSD.Abstract
Objective: The authors examined the relationships among history of previous assault, severity of rape, acute plasma cortisol level after rape, and development of rape-related post-traumatic stress disorder (PTSD).
Method: Blood samples were drawn from 37 adult female rape victims within 51 hours after they had been raped. The subjects were assessed for history of previous assault and for the presence of PTSD 17-157 days (mean = 90 days) after the rape.
Results: Women with a history of previous assault had a lower mean acute cortisol level after the rape but a higher probability of subsequently developing PTSD. A significant interaction between history of previous assault and the severity of the index rape was observed: only women who had never been assaulted before had higher cortisol levels following high-severity rapes (those which included injury or multiple types of penetration) than low-severity rapes.
Conclusions: The authors conclude that previous traumatization may attenuate the acute cortisol response to trauma.
Cortisol helps us fight or run. It's not surprising that a woman dealing with a first assault would have a higher level of cortisol immediately after it than a woman who faced physical abuse every weekend. The paper doesn't say anything about the relationship of trauma to long term levels of cortisol or to long term physical pain.