Raised cortisol levels can also be explained by glucose/sugar/fructose. (I'm not making this up)
Quote:
Cortisol has many functions. It helps the body use sugar (glucose) and fat for energy (metabolism), and it helps the body manage stress. Cortisol levels can be affected by many conditions, such as physical or emotional stress, strenuous activity, infection, or injury.
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Source:
http://www.webmd.com/a-to-z-guides/cortisol-14668
I'm not 100% sure yet, but I think my pain levels were/are almost directly correlated to cortisol levels.