Across a lifetime of small, unconsidered choices — how we sit, what we eat, how long we stay still, how hard we push without rest — the joints quietly absorb the cost. Rheumatologists, who witness the accumulated damage at its most irreversible, have named four specific habits that drive this deterioration and accelerate the path toward arthritis and chronic pain. Their counsel is not abstract: it is drawn from decades of treating people who did not know, until too late, that the body was keeping score. The good news is that awareness, arrived at early enough, can still change the ending.