Many people believe that weather-sensitive pain is a myth, a complaint taught to them by their parents to explain why they were grouchy or not feeling well on any particular day. Recently, however, the medical community has come on board, reporting that the phenomenon is real.
What is confusing is that the barometric pressure is the determining factor, not the weather we see outside at the moment. Most often a falling barometer is the culprit, although in a minority of cases the opposite can be true. The effect is also more pronounced the colder it is.