How you think shapes how you live with MCS. That is true, it is in the pain literature, and it is in the one controlled trial. It is also true that thought cannot reset a sensitized receptor any more than it can regrow a limb. Both sentences belong on the same page, and the argument between the camps is mostly people holding one and denying the other.
Mind-body medicine has real findings: expectation changes pain and nausea; chronic stress raises inflammation; fear and hypervigilance amplify symptoms; neuroplasticity is real and lifelong. None of those is in dispute here.
None of them establishes that every biological disorder is reversible by thought. The nervous system regulates the body; it does not have unlimited authority over it. Someone who loses an arm can transform their experience of the loss and cannot grow it back. MCS is more reversible than an amputation — that is where the hope is — but how far, for whom, and by what mechanism, nobody yet knows.
The trial evidence draws the line precisely. Mindfulness changed how people saw their illness; it did not change the illness. That is what a modifier does. The receptor evidence draws it from the other side: TRPV1 sensitization is measured at the airway, below the level thought reaches. Thinking works on the amplifier. It does not work on the sensor.
The practical consequence is not "ignore your mind." It is: use it for what it can do — fear, stress, coping, the life you build inside your limits — and do not let anyone use it to deny what your body is doing or to blame you when it keeps doing it.
What nervous-system work changed for people, outcome by outcome, and whether any of them regained objective tolerance — the one result that would show the mind reaching the sensor.
Use the mind to help the body. Do not use it to deny what the body is doing. Mindset is a modifier; it has not been shown to be the master switch.