As we all know, we have what is called our "animal brain", which is technically called the amygdala. Please see this web site that so eloquently describes it:
http://study.com/academy/lesson/the-amygdala-definition-role-function.html
This is part of our brain that helps us survive in the world. Some would argue that during the "caveman" days or the hunting and gathering days this part of the brain was used for its purpose only, but not necessarily overused. We had to fight, flee, or freeze during any fearful or violent situation, such as being attacked by a wild animal or dealing with famine. However, in today's world it is being overused by every little stress we deal with today, such as abuse in childhood, kids, traffic, unsatisfying work, paying bills, struggling to survive in this ever-changing world, and the list goes on and on.
This has created what some come to believe as "burnout". For every one of these situations that we perceive as a threat our body sends stress signals to the brain, which causes a cascade of issues and eventually can lead to disease in the body.
http://www.vibrantagain.com/burnout-adrenal-fatigue-what-you-should-know/
When one experiences more than one of what are called ACEs as a child, then it could set this child up for a life of chronic issues.
https://www.cdc.gov/violenceprevention/acestudy/about_ace.html
https://acestoohigh.com/got-your-ace-score/
This is a wonderful YouTube video of a TEDx Talk on ACEs and childhood:
I experienced just about every single one of these ACEs as a child and I am sure there are a lot more people out there who have. And I deal with chronic pain on a daily basis, which is worsening as I age. I know what my body needs, but it seems I can't always fulfill those needs because of the unnatural and unnecessary demands placed on me today. The question is: How do we change this for future generations of children so we can decrease or even stop violence and disease? There are cures out there for every disease there is. We are just now discovering this in this information age. We can stop this.