Rheumatoid arthritis isn't the 'wear and tear' arthritis of old age — it's an autoimmune disease in which your own immune system attacks the lining of your joints. That distinction is everything: RA is systemic, it's progressive, and, caught early, it's one of the most treatable autoimmune diseases there is.
In RA the immune system mistakenly attacks the synovium (the joint lining), driving inflammation that, untreated, erodes cartilage and bone permanently. That's the opposite of osteoarthritis, which is mechanical 'wear and tear.' RA classically hits the small joints of the hands, wrists, and feet symmetrically, with morning stiffness lasting over 30–60 minutes. Getting this distinction right changes the entire treatment. Evidence ●●●●●
RA is a systemic inflammatory disease. Beyond joints it causes profound fatigue and can affect the lungs (interstitial lung disease), the heart (chronic inflammation markedly raises cardiovascular risk — and heart disease, not the joints, is the leading cause of death in RA), eyes, and blood vessels, and it raises infection and lymphoma risk. The joints are the headline; the inflammation is body-wide — which is why treating RA protects far more than your hands. Evidence ●●●●○
Joint erosion in RA is permanent, and it can begin within months. There's a well-established 'window of opportunity' early in the disease when aggressive treatment dramatically changes the long-term course — preventing deformity and raising the odds of remission. RA treated early looks nothing like the crippling disease of a generation ago; the whole game is catching it fast. Evidence ●●●●○
How to read the evidence dots
Throughout this guide, ●●●●● means strong, replicated evidence and ○○○○○ means essentially unproven. RA has excellent proven treatments and a busy fringe of unproven 'cures,' so the grades matter: they separate what changes the disease from what merely sells hope.
The RA Guide