"Yes but some people have very temporary pains and others have very chronic and sometimes even debilitating pains. If everyone has stress in their life, why do some have serious TMS and some barely have any?"
That's an excellent question and answers given above do provide good explanations. My take on it, based on what I have observed with my clients and others, is the following:
1. Your genes: Some of us are born hypersensitive to tension and stress. TMS may exhibit itself the same way in all the members of the same family. It could be back pain, or pain and numbness in arms and hands or hereditary hemorrhagic telangiectasia.
2. Trauma during pregnancy: It could be due to trauma experience during pregnancy. The hormonal changes could affect the development of the fetus's brain and how it reacts to stress.
3. Unhappy childhood: Perspectives developed in childhood can shape how we view the world and how we respond to it. Most TMSers grow up in dysfunctional families. Lack of love and support on the one hand and psychological and physical abuse on the hand can lead a child to become highly sensitive to life's challenges. A child can grow up to become extremely self-critical, perfectionist, obsessive, anxious, unhappy, depressed, and so on. All of these create a lot of repressed anger and rage.
4. Conditioning: this is a big one because no matter how the pain started once it becomes a condition response it can last for weeks, months, and years. In fact, I have treated clients whose pain was due to an actual physical injury and had become chronic due to conditioning.
5. Just because: Sometimes your subconscious, like a little child, decides that's how it is going to be and not let go of the pain.
The good news is that regardless of why you might be prone to TMS, it is possible to develop the mental and emotional skills to conquer it and move on. That's what I will be sharing in my upcoming free webinar on 11/10/16. I also plan to do a webinar in December of how to turn problems, stress, and tension into sources of energy and excitement. That is one of the best ways to stop tension from accumulating and causing pain.