Fibromyalgia
When pain is everywhere and no joint is inflamed — the sensitisation picture.
Chronic joint pain explained.
When several joints hurt at once, the pattern — which joints, what time of day, how long the stiffness lasts — usually points to the answer faster than imaging does.
What causes chronic joint pain in multiple joints?
Chronic joint pain affecting several joints usually falls into one of three groups: inflammatory arthritis (rheumatoid arthritis, psoriatic arthritis, and related conditions), widespread osteoarthritis, or central sensitisation such as fibromyalgia, where joints hurt without being inflamed or damaged. Morning stiffness lasting more than 30–60 minutes and improving with movement points strongly toward the inflammatory group and warrants prompt assessment.
At a glance
- Also called
- Polyarthralgia; polyarthritis when joints are visibly inflamed
- ICD-10
- M25.5- (pain in joint) with site codes; M79.7 for fibromyalgia
- Inflammatory clue
- Morning stiffness over 30–60 minutes, improving with movement, with swelling and warmth
- Mechanical clue
- Stiffness under 30 minutes, worse with use through the day, better with rest
- Sensitisation clue
- Widespread pain, tenderness, fatigue, and unrefreshing sleep without joint swelling
- Why speed matters
- Early treatment of inflammatory arthritis meaningfully changes long-term joint outcomes
Key takeaways
- Morning stiffness duration is the single most useful thing you can report to a clinician.
- Inflammatory arthritis is time-critical — early treatment protects joints that later treatment cannot.
- Joints can hurt a great deal without being damaged or inflamed; that is sensitisation, and it is real.
- The three categories overlap — someone with rheumatoid arthritis can also develop central sensitisation, and needs both treated.
Is my joint pain inflammatory or mechanical?
This distinction drives everything that follows, and you can get most of the way there from the history alone.
| Feature | Inflammatory | Mechanical | Sensitisation |
|---|---|---|---|
| Morning stiffness | Over 30–60 minutes | Under 30 minutes | Variable, often all day |
| Effect of movement | Improves | Worsens | Unpredictable |
| Effect of rest | Worsens | Improves | Little change |
| Swelling and warmth | Present | Minimal | Absent |
| Pattern | Often symmetrical, small joints | Weight-bearing, previously injured joints | Widespread, both sides, above and below the waist |
| Other features | Fatigue, fever, rash, eye inflammation | Age-related, activity-related | Fatigue, poor sleep, brain fog |
Persistent swollen joints with prolonged morning stiffness should be assessed promptly. The window in which early inflammatory arthritis treatment changes long-term outcomes is measured in months.
What conditions cause chronic joint pain?
Inflammatory
- Rheumatoid arthritis — symmetrical small-joint involvement in hands and feet, prolonged morning stiffness, fatigue.
- Psoriatic arthritis — may involve whole fingers or toes, with nail changes and often a personal or family history of psoriasis.
- Axial spondyloarthritis — inflammatory back pain in younger adults, improving with exercise and worse with rest.
- Connective tissue disease such as lupus, often with rash, mouth ulcers, hair loss, and marked fatigue.
- Crystal arthritis — gout and calcium pyrophosphate disease, typically episodic and intensely painful.
Mechanical and degenerative
Osteoarthritis in several joints — commonly hands, knees, hips, and the spine. Pain increases with use, stiffness is brief, and progression is gradual.
Central sensitisation
Fibromyalgia and related presentations produce genuine joint pain without inflammation or structural damage. The amplification happens in the central nervous system. See widespread pain and fibromyalgia.
How is chronic joint pain treated?
Treatment follows the category, which is why getting the category right comes first.
- Inflammatory arthritis — disease-modifying drugs (DMARDs) and, where indicated, biologics, prescribed and monitored by a rheumatologist. These change the disease course, not just the symptoms.
- Osteoarthritis — exercise therapy first-line, load management, weight management where relevant, topical and oral analgesia, and joint replacement for end-stage disease.
- Central sensitisation — graded activity, sleep work, education, and psychological or pain-retraining approaches. Anti-inflammatory drugs have little to offer here because there is no inflammation to treat.
Across all three, exercise appears in the plan. The prescription differs — dose, type, and how much soreness is acceptable — but movement is not optional in any of them.
Where Karuna fits
Karuna treats the sensitisation layer. That makes our program a fit for chronic joint pain that persists despite good medical management — including people whose inflammatory arthritis is well controlled on medication but who still hurt, a common and frustrating situation.
Our program does not replace rheumatology care. If you have or may have inflammatory arthritis, that assessment and treatment comes first; we work alongside it. See how the program works.
Frequently asked questions
What is the ICD-10 code for chronic joint pain?
M25.5- covers pain in joint, with a fourth character for site and a fifth for laterality — for example M25.561 for right knee pain. M79.7 is used for fibromyalgia.
Can weather really affect joint pain?
Many people report it consistently, and studies have found small associations with barometric pressure and humidity — though the effect sizes are modest and the literature is mixed.
The experience is real regardless of what the group-level statistics show. If your pain tracks the weather, plan around it rather than arguing with it.
Which blood tests are used for joint pain?
Typically inflammatory markers (CRP and ESR), rheumatoid factor, anti-CCP antibodies, and sometimes ANA, urate, and HLA-B27 depending on the picture.
Important caveat: normal blood tests do not exclude inflammatory arthritis, and a positive rheumatoid factor does not confirm it. Tests inform a clinical diagnosis rather than making one.
Does cracking your knuckles cause arthritis?
No. Studies looking for a link between habitual knuckle cracking and hand osteoarthritis have not found one.
The sound comes from gas bubbles collapsing in the joint fluid, not from damage.
Related guides.
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