All living humans have Tension Myositis Syndrome to some degree. It's just part of life. We will always have some kind of human pain and that's just part of being alive, you will feel pain as a human, but you don't have to experience chronic pain any longer than it takes you to shift your mindset on how pain works. When chronic pain is interfering with your ability to join life, your body is trying to tell you something.
Anyone can have TMS. According to Sarno, the neural pathways that are created during childhood trauma in relation to suppressing emotions are what cause chronic pain later in life. The thing is, you are not conscious of the fact that you have been suppressing these emotions. You may not even believe you suffered any childhood trauma or that there is anything to heal from. When you suppress your emotions, where do they go? If the emotions are not released, they remain in the body and cause chronic pain and/or conditions. The pain is 100% real, and it has been studied and proven by a mild oxygen deprivation in the painful part of the body.
According to tmswiki.org, anyone with the following personality traits has an even higher chance of having TMS; perfectionism, goodism, people-pleasing, legalist, stoic, anxiety/fear, low self-esteem, hostile/aggressive. *Please note - you don't need to fall in all of these categories. Even one of these traits is enough to have TMS.
If any or all of this resonates with you, and you've already ruled out anything life-threatening with your doctor, it's safe to say you have TMS.