Listening to the Joe Rogan podcast with Dr. Mark Gordon I came across some really interesting information. It seems when a person suffers a Traumatic Brain Injury there can be lasting hormonal changes that until recently have been widely unknown. TBI can have an impact on the sensitive little Pituitary Gland.
The Pituitary Gland is and endocrine organ the size of a pea. This gland secretes 9 hormones that regulate homeostasis. When we have a concussion or any other type of TBI there can be a disruption to this organ and one of the side effects can be very low testosterone. Difficulty sleeping, anger, depression, recovery problems, etc...can all be side effects.
Boxers, Football players and Military personal have shown some hormonal changes after some severe TBI incidents. Here a link to a few abstracts from Dr. Gordon's TBI webpage. LINK.
Here is an article discussing the discovery and ramifications of Pituitary disruption from TBI's.
Using Hormones to Heal TBI.