I definitely had more problems with endo after my concussion. I have also had two friends develop reproductive problems after their accident, which involved concussion for both of them. I do believe that concussion, does create hormone regulation problems, perhaps via the pituitary gland getting squished, or some other function of trauma, perhaps increased stress hormones, or an impinged vertebra somewhere in the spine from whiplash? Not a lot of research out on this, but for me, it was like night and day, before and after my car accident.

T