Joint pain — separating the common from the treatable

What joint pain usually turns out to be

The word "arthritis" gets applied to almost any pain from the neck to the ankles, and it carries an implication — a progressive inflammatory disease — that is wrong most of the time. The community data are clear about the proportions.

In a rural community survey of 2,259 adults with 89% participation, the commonest rheumatic disorder by a wide margin was soft-tissue rheumatism at 28.0% (26.1–29.8) — tendon, bursa and muscle pain rather than joint disease. All arthritis together accounted for 12.2%, osteoarthritis 11.4%, knee osteoarthritis 8.9%, rheumatoid arthritis 0.4%, spondyloarthropathy 0.2%, and gout 0% — not one case.^[1] The large multisite COPCORD study of 56,541 Indians found the same ordering: musculoskeletal pain at a point prevalence of 16.14% (rural 20%, urban 10.3%), osteoarthritis 4.39%, rheumatoid arthritis 0.34%, spondyloarthritis 0.23%, gout 0.05%.^[2]

Knee osteoarthritis specifically is common: 28.7% in a five-site Indian community study using formal radiographic grading, and significantly more in women (31.6%).^[3]

There is a West Bengal figure worth putting alongside these. Among rural elderly people in Singur, Hooghly, 56.8% had chronic musculoskeletal pain, most often in the knee (49.6%) and low back (33.1%).^[4] Yet in the national LASI survey of adults aged 45 and over, West Bengal recorded the lowest self-reported musculoskeletal disorder of any Indian state — 33.1%, against a national 53.5%.^[5] Read together, those two say something specific: symptoms here are at least as common as anywhere in India, but the diagnosis is not being made. That is under-recognition, not low disease.

The two reports that worry people unnecessarily

Uric acid

A raised uric acid on a report is one of the commonest reasons someone arrives convinced they have gout. The numbers do not support it. In a survey of 300 rural adults over 30 in Karnataka, 32.7% had hyperuricaemia^[6] — roughly one adult in three. Community gout prevalence in Indian surveys is 0% to 0.13%.^[1][2]

So a raised uric acid is around 250 times more common than the disease it is supposed to indicate. Gout is a clinical diagnosis — a sudden, severe, red, hot joint, classically the base of the big toe, resolving over days — and the uric acid level may even be normal during an attack. Treating an asymptomatic raised uric acid to explain diffuse body ache treats a number rather than a person.

Vitamin D

The same logic applies more strongly. Vitamin D deficiency in Indian adult studies ranges from 30% to 91.2% depending on the cut-off used.^[7] In rural West Bengal specifically, 51% of postmenopausal women in Singur were deficient below 20 ng/ml, with a further 19% insufficient.^[8]

A finding present in half or more of the healthy population has almost no discriminating power as an explanation for one individual's symptom. That does not mean vitamin D should never be replaced — deficiency is worth correcting, particularly in older people and for bone health. It means that finding it does not close the case, and if the pain persists after replacement, the original question is still open. In practice, a great many people in this district have been given vitamin D sachets in place of a diagnosis.

Inflammatory or mechanical? The question that actually matters

This distinction does more work than any test, and it is made from the history.

Back pain that is inflammatory

Axial spondyloarthritis is the diagnosis most often missed, and the delay is measurable: Indian patients with ankylosing spondylitis were diagnosed a mean of 6.9 ± 5.2 years after symptoms began. They had been labelled non-specific back pain (35.1%), degenerative disc disease (25.9%), rheumatoid arthritis (20.4%) and — relevant in a TB-endemic district — spinal tuberculosis (16.6%). The wrong initial diagnosis was made by orthopaedic surgeons in 75.9% of cases and general physicians in 50%.^[9]

The clue is that the back pain is inflammatory: it began before 45, came on gradually, is worse with rest and in the second half of the night, improves with exercise, and responds well to anti-inflammatories. Young men with years of "just back pain" that fits that description should be reassessed.

One caution on testing: 4.08% of healthy North Indians carry HLA-B27,^[10] against an axial spondyloarthritis prevalence of about 0.23%. A positive HLA-B27 in someone with ordinary mechanical back pain is far more often a healthy carrier than a diagnosis, and the test is useful only when the clinical picture already fits.

Joint pain after a fever: chikungunya

This is a genuine and under-recognised cause of chronic joint pain in West Bengal. In the 2016 outbreak, 24.64% of 641 symptomatic patients in West Bengal tested positive for chikungunya,^[11] and in Kolkata between 2020 and 2022, 15.1% of dengue-negative febrile patients were chikungunya-positive by ELISA, with the ECSA genotype circulating and cases peaking in September.^[12]

How long the joint pain lasts depends on which study you read, and the difference is instructive. A global meta-analysis of 6,532 patients, mostly hospital-based, found 43% had not recovered at three months and 21% at twelve months.^[13] An Indian community cohort following an entire village after the 2006 epidemic found a much lower burden: 4.1% of the whole village population still had musculoskeletal pain at twelve months, and true chronic inflammatory arthritis in only 0.3%, with 65% of acute illness resolving within four weeks.^[14] The hospital figure counts those unwell enough to attend; the community figure counts everyone. Both are true of different populations.

Dengue behaves differently and it is worth separating them. In a prospective cohort, persistent symptoms at three months affected 25% after dengue against 69% after chikungunya, and at twelve months 5% against 17% — and dengue produced musculoskeletal symptoms without arthritis, where chikungunya produced genuine joint inflammation.^[15] Persistent joint pain after dengue is uncommon and usually settles; after chikungunya it is common and sometimes needs treating as inflammatory arthritis.

Two things this district does not have

Both are worth stating explicitly, because both circulate as explanations for body pain in West Bengal and neither applies here.

Skeletal fluorosis. High-fluoride groundwater in West Bengal is a problem of the western plateau and one North Bengal district: Bankura, Purulia, Birbhum, Dakshin Dinajpur (701 habitations, about 252,000 people, 17% of habitations), Uttar Dinajpur, Malda and one block of South 24 Parganas — 43 blocks across 7 districts, about 615,000 people above 1.5 mg/L.^[16] Cooch Behar is not among them; North Bengal samples from Jalpaiguri, Darjeeling and Siliguri measured 0.25–0.46 mg/L, within safe limits.^[17] Fluorosis is worth considering only where there is a specific history of living in an affected district — Dakshin Dinajpur being the relevant one for people who have moved.

Arsenic. The arsenic belt of West Bengal lies east of the Ganga — Nadia, Murshidabad, North 24 Parganas, Malda, and parts of Bardhaman, Hooghly and South 24 Parganas.^[16] Cooch Behar is not on that list. More importantly, chronic arsenic exposure causes skin changes, cancers, vascular and respiratory disease and peripheral neuropathy — it is not an established cause of arthritis. Burning feet and tingling from arsenic neuropathy can be described as joint pain by a patient, but that is a different problem with a different investigation.

The painkiller question

Long-term NSAIDs are the default treatment for joint pain here and they carry real cost. An Indian prescribing audit found fixed-dose NSAID combinations in about 35% of orthopaedic outpatient prescriptions, with only 40% co-prescribed a gastroprotective agent and 32% receiving COX-1 inhibitors with none at all.^[18] Among rural elderly in Singur, chronic pain was strongly associated with over-the-counter analgesic self-medication.^[4] This is the direct link to the acidity guide: 22% of patients with upper GI bleeding in an eastern India series had been taking NSAIDs.

Steroid injections into a knee are useful in the right situation but their benefit may last under four weeks, and repeated injections carry potential harm including cartilage loss; across international guidelines the consensus is "recommended with caution".^[19] An injection given repeatedly by someone who has not examined or imaged the knee is not treatment.

What is done at the consultation

The pattern first — inflammatory, mechanical or soft-tissue — from the history and the examination, because that determines everything else. Then blood count, ESR or CRP, and, where the pattern is inflammatory, rheumatoid factor and anti-CCP. Uric acid and vitamin D are checked when there is a reason, and interpreted against how common abnormal results are. X-rays where they will change something. Referral to rheumatology or orthopaedics where the answer lies there, said plainly rather than deferred.