Answer
This is a fascinating one. I have treated a few patients for whom weather was a primary trigger. There was one in particular who stated that he could be in a windowless basement and his symptoms would trigger when the weather shifted.
I believe that we can sense things, being the animals that we are. Kind of like other animals sense things but it happens on a subconscious level. Things like a change in barometric pressure can absolutely become a part of a conditioned response.
In other words, our brains can sense a shift in weather without us even being conscious of it and this can become the stimulus that triggers a physiological response.
-Derek
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