Fibromyalgia: Real Pain From a Nervous System Set Too High
Most people with this diagnosis have been asked, in one form or another, whether it is real. Sometimes by a doctor, more often by an employer, a relative, or themselves at three in the morning. The question deserves a proper answer rather than reassurance, because the answer is where the treatment comes from.
🧬 What can actually be measured. Blood tests are normal and scans are normal, and that is exactly what would be expected — because nothing is wrong with the joints, muscles or organs. The abnormality is in how pain signals are processed, and that has been demonstrated by several independent methods.
Pain thresholds are measurably lower on formal testing. Brain imaging shows amplified responses to a standard painful stimulus compared with people without the condition. The descending pathways that normally dampen pain signals are less effective. And in a substantial subgroup, biopsy shows a reduction in the smallest nerve fibres in the skin.
So the pain is not imagined, not exaggerated and not a personality trait. The volume control on the pain system is set too high, and it is a physical abnormality that ordinary tests are simply not designed to look for.
🔎 How it is diagnosed now
Older descriptions — including many still circulating — describe a physical examination in which pressure is applied to eighteen specific points, with a diagnosis requiring tenderness in eleven of them.
That test was abandoned in 2010. It was unreliable between examiners, it depended entirely on how hard the examiner pressed, it took no account of the fatigue, sleep and cognitive symptoms that dominate many people lives, and it systematically under-diagnosed men, whose tenderness distribution tends to differ. Anyone told they cannot have fibromyalgia because they were not tender at enough points was assessed by a method that no longer exists.
What replaced it looks at two things together: how widely pain is distributed across the body, and how severe the accompanying symptoms are — fatigue, unrefreshing sleep and cognitive difficulty, alongside a checklist of other physical symptoms. Both need to have been present for at least three months.
The other important change is conceptual. This is a positive diagnosis, not a diagnosis of exclusion. Other conditions still need ruling out, and a person can have fibromyalgia alongside rheumatoid arthritis or lupus rather than instead of them — which the older framework did not allow, and which left a great many people with two problems and treatment for one.
😴 The part that is not about pain
Describing this as a pain condition undersells it, and it is a common reason people feel their account has not been heard.
Sleep is abnormal in a specific way. Studies of sleep recordings show fast waking-type brain activity intruding into the deepest stages of sleep. The result is that sleep of apparently normal duration produces no restoration — people wake as tired as they went to bed, and often stiff and aching. This is measurable and it is not insomnia, which is why sleeping tablets that increase sleep duration frequently do not help.
It also runs in both directions. Poor sleep amplifies pain the following day, and pain fragments sleep the following night. Experiments depriving healthy volunteers of deep sleep produce widespread aching and tenderness within days. That loop is one of the more approachable targets in treatment.
Cognitive difficulty is the other under-acknowledged part. Trouble finding words, losing the thread mid-sentence, difficulty holding several things in mind at once. It is measurable on formal testing, it is not early dementia, and it fluctuates with sleep and pain levels rather than progressing.
Alongside those: irritable bowel symptoms, migraine, jaw pain, restless legs, bladder urgency, sensitivity to noise, light, cold and smells. These are not a coincidental collection — they share the amplification mechanism described above, which is why they cluster.
⚠️ What has to be excluded first
🔬 Several treatable conditions produce widespread pain and fatigue, and this diagnosis should not be accepted until they have been looked for.
An underactive thyroid. Vitamin D deficiency. Inflammatory arthritis in its early stages. Lupus and related conditions. Coeliac disease. Sleep apnoea, which produces unrefreshing sleep and daytime pain and is missed constantly. Raised calcium. Low B12.
And two that are specific and easily overlooked. Muscle pain caused by statins, which is dose-related and resolves on stopping. And in anyone over fifty with new pain and marked stiffness in the shoulders and hips, particularly in the mornings, polymyalgia rheumatica — which responds dramatically to low-dose steroids within days, and where that response is itself part of the diagnosis. Missing it means years of the wrong treatment for something that would have resolved.
A reasonable baseline: full blood count, inflammatory markers, thyroid function, calcium, vitamin D, B12, and a muscle enzyme level. Normal results support the diagnosis rather than undermining it.
🏃 The exercise problem, and how to get round it
Exercise has the strongest evidence of any treatment here, better than any drug. And exercise makes the pain worse. Both are true, and reconciling them is the single most useful thing this article can offer.
The mechanism is that a sensitised system over-responds to the ordinary muscle soreness of activity, and the flare can arrive a day or two later rather than immediately — so it is not connected to the activity that caused it. What follows is a predictable cycle: a good day prompts catching up on everything, the flare arrives two days later, the person rests until it passes, then a good day prompts catching up again. Over months, capacity falls.
✅ What works instead.
Start far below what you think you can manage. If ten minutes of walking feels achievable, start with three. The starting point should feel almost embarrassingly easy, because it needs to be sustainable on a bad day rather than achievable on a good one.
Increase by a very small amount every week or two, not every session. Ten per cent is a reasonable step.
Work to a plan rather than to how you feel. The same amount on good days and bad days. Doing more on a good day is what produces the crash.
Expect it to hurt more for the first weeks. That is the sensitised response, not damage, and it settles as conditioning improves. Knowing this in advance is what allows people to continue through it.
Warm water helps considerably — exercise in a heated pool has particularly good evidence and is far easier to tolerate at the start.
💊 What the medication actually does
An honest account, because the gap between what people expect and what these drugs deliver is a common reason for abandoning treatment.
| Option | Where it stands |
|---|---|
| Duloxetine | Licensed for this condition in some countries and among the best supported. Acts on the descending pathways that dampen pain, and helps mood where that is also affected. Given at a therapeutic dose rather than a starting one |
| Low-dose amitriptyline | The most widely used first choice worldwide, taken in the evening at a fraction of the antidepressant dose. Particularly useful because it improves sleep quality, which improves pain |
| Pregabalin and gabapentin | Act on nerve signalling and reduce pain in a proportion of people. Need starting low and increasing slowly, or the drowsiness ends treatment early |
| Other antidepressant classes | Used where the above are not tolerated, with weaker evidence |
| Anti-inflammatories and paracetamol | Largely ineffective, because there is no inflammation to treat. Worth knowing before spending years escalating them |
| Steroids | No role. A dramatic response to steroids suggests the diagnosis is something else |
| Opioids | Not recommended. They do not work well for this type of pain, and long-term use can increase pain sensitivity, making the underlying problem worse |
Two things to set expectations properly. The realistic goal is a meaningful reduction rather than elimination — roughly a third less pain, in a proportion of people who take them. And medication works considerably better alongside exercise and pacing than instead of them. A drug alone, in someone whose activity has collapsed and whose sleep is broken, is being asked to do more than it can.
📋 The things that make the most difference
- Pace by plan rather than by symptoms — the single most effective change most people make
- Protect sleep timing — consistent hours matter more here than in most conditions, given how central sleep is
- Break tasks into shorter blocks with breaks taken before they are needed, not after
- Heat — baths, heat pads, warm pools. Cheap, safe, genuinely helpful
- Treat the neighbours — the bowel symptoms, the migraines, the restless legs. Each one treated reduces the total load
- Address low mood directly where it is present, since it amplifies pain rather than merely accompanying it
- Get the diagnosis in writing — it matters for employers, for benefits, and for the next doctor who has not met you
- Ask for structured psychological treatment if offered, which targets the pain response rather than implying the pain is psychological
One reassurance that is often not given and should be. This condition does not damage joints, does not deform, does not progress to disability in the way inflammatory arthritis can, and does not shorten life. It is limiting and it is not destructive, and many people improve substantially over time. The article on chronic fatigue covers a closely related condition with which it overlaps considerably.
🩺 When to seek help
- New swollen or hot joints — not a feature of this condition, and needs assessment
- Marked morning stiffness in shoulders and hips over fifty — ask specifically about polymyalgia rheumatica
- Unexplained weight loss, fever or night sweats — needs investigation
- Muscle pain after starting a cholesterol tablet — a common and reversible cause
- Snoring with unrefreshing sleep — possible sleep apnoea
- Weakness rather than pain, or difficulty rising from a chair — a different problem
- The diagnosis made without basic blood tests — ask for them
- Escalating opioid use — worth reviewing, since it can be increasing the pain
- Low mood or thoughts of self-harm — common in chronic pain, treatable, and worth raising
Treatment is stocked in the antidepressants category, including Cymbalta (duloxetine), which acts on the pain-dampening pathways rather than on mood alone, and Elavil (amitriptyline), used in the evening at low dose for its effect on sleep quality. Neurontin (gabapentin) and Gabatop act on nerve signalling and need starting low. None of these replaces graded activity and pacing, which have better evidence than any of them.
❓ Frequently asked questions
Is fibromyalgia real?
Yes, and it has been demonstrated by several independent methods. Pain thresholds are measurably lower on formal testing, brain imaging shows amplified responses to a standard painful stimulus, the pathways that normally dampen pain signals are less effective, and a substantial subgroup shows reduced small nerve fibres on skin biopsy. Blood tests and scans are normal because nothing is wrong with the joints or organs — the abnormality is in pain processing.
I was not tender at enough points. Does that rule it out?
No. The eighteen tender points test was abandoned in 2010 because it was unreliable between examiners, depended on how hard they pressed, ignored the fatigue, sleep and cognitive symptoms, and systematically under-diagnosed men. Current criteria assess how widely pain is distributed alongside symptom severity, over at least three months. If you were assessed by tender points, you were assessed by a method that no longer exists.
Why am I exhausted after sleeping eight hours?
Because the sleep itself is abnormal rather than short. Sleep recordings show fast waking-type brain activity intruding into the deepest stages, so sleep of normal duration produces no restoration. This is why sleeping tablets that lengthen sleep often do not help. It also runs both ways — poor sleep amplifies pain the next day, and pain fragments sleep the next night.
Is fibro fog the start of dementia?
No. The difficulty with word-finding, losing the thread and holding several things in mind is real and measurable on formal testing, and it fluctuates with sleep and pain levels rather than progressing. It improves when sleep improves. It is one of the most disabling parts of the condition and one of the least acknowledged.
What else should be tested before accepting this diagnosis?
Thyroid function, vitamin D, B12, calcium, inflammatory markers, a full blood count and a muscle enzyme level. Also consider sleep apnoea, coeliac disease, early inflammatory arthritis and lupus. Two specific traps: muscle pain caused by statins, which resolves on stopping, and in anyone over fifty with morning stiffness in shoulders and hips, polymyalgia rheumatica, which responds dramatically to low-dose steroids.
Why does exercise make it worse when I am told to do it?
Because a sensitised system over-responds to ordinary muscle soreness, and the flare often arrives a day or two later so it is not connected to what caused it. Exercise still has the strongest evidence of any treatment. The answer is to start far below what feels achievable — three minutes rather than ten — increase by ten per cent every week or two, and do the same amount on good and bad days.
What is the boom and bust cycle?
A good day prompts catching up on everything that was missed, the flare arrives two days later, rest continues until it passes, and then the next good day prompts catching up again. Over months capacity falls rather than rises. Breaking it means working to a plan rather than to how you feel, and taking breaks before they are needed rather than after.
Why do painkillers not help?
Because anti-inflammatories and paracetamol act on pain generated by tissue damage and inflammation, and there is no inflammation here. The drugs with evidence act on nerve signalling and on the pathways that dampen pain instead. Opioids are specifically not recommended — they work poorly for this type of pain and long-term use can increase pain sensitivity, worsening the underlying problem.
How much can medication realistically achieve?
A meaningful reduction rather than elimination — roughly a third less pain, in a proportion of people who take them. That is a genuine improvement and it is not a cure, and expecting more is a common reason for abandoning treatment that was working. Medication also performs considerably better alongside graded activity and pacing than on its own.
Will it get worse over time?
It does not damage joints, does not deform, does not progress to disability the way inflammatory arthritis can, and does not shorten life. It is limiting rather than destructive, it fluctuates, and many people improve substantially over time, particularly once pacing and conditioning are established. That reassurance is frequently not given and is worth having.
📑 Sources and editorial
- Diagnostic criteria for fibromyalgia and the 2010 removal of tender point examination
- Evidence on lowered pain thresholds, altered central pain processing on functional imaging, and impaired descending inhibition
- Literature on small fibre pathology in a subgroup of patients
- Polysomnographic findings of alpha wave intrusion into slow wave sleep, and experimental slow wave sleep deprivation in healthy volunteers
- Literature on cognitive dysfunction in fibromyalgia and its relationship to sleep and pain
- Guidance on differential diagnosis including thyroid disease, inflammatory arthropathy, polymyalgia rheumatica, sleep apnoea and statin myopathy
- Systematic reviews of aerobic and aquatic exercise, and evidence on graded activity and pacing
- Trial evidence for duloxetine, amitriptyline, pregabalin and gabapentin, including effect sizes and responder rates
- Evidence on the ineffectiveness of anti-inflammatory analgesics and on opioid-induced hyperalgesia
- Long-term outcome data on function and prognosis
- Related reading: chronic fatigue syndrome, amplified physical symptoms, graded exercise
- Related products: antidepressants category
- RXshop Editorial Team — reviewed by Emily Chen, MD, Internal Medicine
Medical Disclaimer: The information in this article is for educational and informational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment. Always seek guidance from a qualified healthcare provider with any questions you may have regarding a medical condition, and before starting, stopping or changing any medication.