Why Can an Old Injury Ache Before a Change in Weather?

A Claim as Old as Folk Medicine Itself

The idea that an old injury or arthritic joint can "predict" an incoming change in weather is one of the oldest and most widely held pieces of folk medical wisdom — and, unusually for such a claim, it has received genuine, large-scale scientific attention.

A Real, if Modest, Association

A large multi-country study tracking self-reported weather sensitivity and joint pain in older adults with osteoarthritis across six European countries found a genuine association between weather parameters — particularly falling barometric pressure and increasing humidity — and increased joint pain, though the strength of this association varied meaningfully between individuals and locations (Timmermans et al., 2014).

A Plausible, if Not Fully Settled, Mechanism

The leading proposed explanation involves changes in barometric pressure directly affecting pressure within the joint capsule and surrounding tissue, potentially altering the mechanical load on already sensitised nerve endings in an arthritic or previously injured joint. The effect size is generally modest and the research is not fully conclusive on precise mechanism, but the phenomenon itself — unlike many such folk beliefs — does appear to have a genuine, measurable basis.