Why Does the Immune System Attack Itself?
July 28, 2026Core Framework & Diagram Rheumatoid Arthritis
July 28, 2026
It's not 'old-age joint pain' — rheumatoid arthritis is a sustained civil war targeting the joints
By the Editors 1-min read
Do you know someone like this: wakes up in the morning with swollen, stiff fingers that take thirty minutes to an hour to 'loosen up'? Or symmetric pain in both hands, wrists, and knees — but X-rays show 'nothing obvious,' they take pack after pack of pain pills, but the cause can't be found?
These are very likely early warning signals of rheumatoid arthritis (RA). Approximately one percent of people globally have it; estimated Chinese patients exceed five million. Its earliest peak onset is at thirty to fifty-five years old — precisely when hands are most needed for work.
Without treatment, fifty percent of patients develop significant joint deformity within ten years of onset; thirty percent lose basic work capacity within twenty years. But with early diagnosis plus standardized treatment, today's rheumatoid patients can live and work completely normally. The key: recognize it, and don't let it drag on as 'ordinary joint pain.'
KEY TAKEAWAYS
01
Rheumatoid arthritis is NOT 'age-related degenerative joint disease' — it's an autoimmune disease targeting joint synovium, with peak onset at thirty to fifty-five years, presenting with symmetric joint swelling, pain, and morning stiffness over one hour.
02
'Citrullinated proteins' are the core self-antigen: smoking and periodontal disease activate PAD enzymes, producing large amounts of citrullinated proteins and triggering ACPA autoantibodies — this process begins five to ten years before symptoms appear.
03
Pannus is the most dangerous pathological structure, causing irreversible cartilage and bone erosion through MMP secretion, osteoclast activation, and large amounts of inflammatory cytokines (TNF-α, IL-1β, IL-6).
04
Starting standardized treatment within six to twelve weeks of symptom onset is the 'golden window' — can significantly reduce joint destruction and disability risk. Over forty percent of patients achieve 'clinical remission' under standardized treatment.
05
RA isn't only a joint disease: cardiovascular disease risk rises one and a half to two times; lung disease (ILD) is a major complication. Both need systematic evaluation in follow-up.
Art 59
Systemic Lupus Erythematosus
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Art 60
Thyroid Autoimmunity
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