Compare conditions

Put any two — or three — conditions side by side, adult or pediatric, to spot the look-alike differences fast, row by row.

Rheumatoid Arthritis

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In one line

·Your immune system is attacking the soft lining inside your joints.

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Normal physiology

·Every joint where bones meet has a thin, soft lining called the synovium that makes slippery fluid so the bones can glide past each other without grinding. Your immune system patrols your body to attack germs and foreign invaders, but it leaves your own tissues alone because they carry the right markers. Keep that picture in your head, because all the weird findings in rheumatoid arthritis make sense only as a change from this normal setup.

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What goes wrong

·In rheumatoid arthritis, your immune system loses the ability to tell 'self' from 'foreign' and starts attacking the synovium as if it were a germ. White blood cells flood the joint, the synovium swells and thickens, and the inflamed tissue releases enzymes that eat away cartilage and bone. That one upstream break—autoimmune attack on the synovium—explains every downstream finding you see.

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Hallmark signs

·Small joints in the hands and feet are swollen, warm, and tender on both sides of the body
·Morning stiffness that lasts over an hour
·You feel very tired all the time
·The DIP joints (the fingertip knuckles) are NOT swollen or sore
·Rheumatoid nodules (firm lumps under the skin, often near elbows)
·Low-grade fever
·Joint damage or deformity (in advanced or untreated disease)
·Lung problems (shortness of breath, dry cough) or chest pain

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Red flags · escalate now

·Severe joint pain that suddenly gets much worse — may mean infection in the joint (septic arthritis) on top of rheumatoid arthritis
·New shortness of breath, persistent dry cough, or chest pain — may mean lung involvement (pleuritis or interstitial lung disease)
·Fever above 101°F (38.3°C) — may mean infection, especially if on immune-suppressing medicines
·Sudden vision changes or severe eye pain — may mean scleritis (inflammation of the white of the eye), which can damage vision
·Visible joint deformity or inability to use the hand or foot — means the disease is advancing and needs urgent treatment adjustment

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Workup

·Rheumatoid factor (RF)
·Anti-CCP antibodies (anti-cyclic citrullinated peptide)
·ESR (erythrocyte sedimentation rate) and CRP (C-reactive protein)
·Complete blood count (CBC)
·Hand and foot X-rays (anteroposterior and oblique views)
·Ultrasound or MRI of the hands and wrists (if X-ray is normal but suspicion is high)
·Hepatitis B and C screening, tuberculosis testing (IGRA or PPD) before starting immunosuppression

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Treatment

·Methotrexate (a DMARD, disease-modifying antirheumatic drug) with folic acid 1 mg daily
·Biologic DMARDs: TNF inhibitors (adalimumab, etanercept, infliximab, certolizumab, golimumab), IL-6 inhibitors (tocilizumab, sarilumab), T-cell costimulation blocker (abatacept), or B-cell depletion (rituximab)
·JAK inhibitors (tofacitinib, baricitinib, upadacitinib)
·Short-course oral corticosteroids (prednisone 5–10 mg daily for 2–4 weeks, then taper) during flares or as a bridge while waiting for DMARDs to work
·NSAIDs (ibuprofen 400–800 mg three times daily, naproxen 500 mg twice daily) for symptom control
·Vaccinate (inactivated flu, pneumococcal, hepatitis B, herpes zoster recombinant) before starting immunosuppression
·Physical therapy and occupational therapy for joint protection, range-of-motion exercises, and assistive devices

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NCLEX trap

·Osteoarthritis is wear-and-tear — the cushion inside a joint breaks down over years, usually hitting one knee or one hip harder. Rheumatoid arthritis is the immune system attacking the slippery lining inside joints on both sides of the body at the same time (both wrists, both hands). They are completely different diseases with different causes and different treatments.
·Pain pills and ice only cover up the symptoms. The real problem in rheumatoid arthritis is runaway antibodies in the blood — rheumatoid factor and anti-CCP — that tell white blood cells to attack the joint lining. You must start a DMARD (a drug that slows the immune attack) like methotrexate within 3 months of diagnosis to stop permanent joint damage. Pain pills alone will not stop the disease.
·Prednisone works fast to calm swelling and pain, but it thins bones, raises blood sugar, and hurts the immune system if you use it every day for a long time. The right move is to start methotrexate (the DMARD that actually stops the disease) first, then use a short burst of prednisone — just a few weeks — to bridge the gap while the methotrexate kicks in.
·The DIP joint (the knuckle closest to the fingertip) is usually spared in rheumatoid arthritis — it does not swell. Rheumatoid arthritis hits the PIP joints (middle knuckles) and MCP joints (knuckles at the base of the fingers). If the DIP is swollen, think psoriatic arthritis or osteoarthritis instead.
·In rheumatoid arthritis, the immune attack can loosen the ligaments that hold the top two neck bones together (C1 and C2). When those bones slip forward (atlantoaxial subluxation), they can squeeze the spinal cord and cause paralysis or death. Any neck pain, tingling in the arms, or trouble walking needs imaging and careful handling — especially before surgery or intubation.
·Feeling better means the medicine is working — not that the disease is gone. Rheumatoid arthritis is a lifelong condition. If you stop the DMARD, the immune attack restarts within weeks, and the joints will swell and scar again. You must keep the medicine going, even when the person feels great, to keep the disease quiet.

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