Also, the anxiety causes the tightness first. Then the tightness causes anxiety. Tools are used to break the cycle. Sometimes meds help.
The tightness is the muscle contraction serving as a defense mechanism to block traumatic emotional nerve transmission. In my research, I have often instantly triggered and stopped anxiety attacks by stimulating the stored memory and/or removing the stimulation.
The most bizarre was a man in his seventies who instantly went into a standing epileptic seizure every time I stimulated a stored memory from when he was five years old. As soon as I removed memory stimulation, the seizure would stop. This was repeated four or five times with the same response each time.
I find it relatively easy to totally cure PTSD, even when working this Vietnam Vets who have had it since the early 1970’s. The problem with the various medical treatments is that they do not identify the storage location of the memory. They only deal with the anchor point in the physical body.