Fibromyalgia: Symptoms, Causes, Diagnosis and All Treatment Options Explained
- Dr. Ryan Heals, Pharm.D.
- Jun 24
- 8 min read
Fibromyalgia is one of the most misunderstood and misdiagnosed conditions in medicine. An estimated 4 million Americans — approximately 2% of the population — live with fibromyalgia, yet it takes an average of 5 years from first symptoms to correct diagnosis. It has historically been dismissed as psychological or "all in the mind" — a stigma that the medical community has worked hard to correct as our understanding of the neurobiology of chronic pain has deepened significantly.
Fibromyalgia is a real, diagnosable, treatable neurological condition. It is not imaginary, not simply stress, and not something patients should be told to push through. With the right diagnosis and the right combination of treatments, the majority of fibromyalgia patients can achieve meaningful reduction in pain and improvement in quality of life.
This complete guide covers what fibromyalgia is, how to recognise its symptoms, how it is diagnosed today, what causes it, and every major treatment option available — including the medicines that are specifically FDA-approved for fibromyalgia.
What is Fibromyalgia?
Fibromyalgia is a chronic condition characterised by widespread musculoskeletal pain, fatigue, sleep disturbance, and cognitive difficulties. It is classified as a central sensitisation syndrome — meaning the central nervous system (brain and spinal cord) becomes hypersensitised, amplifying pain signals throughout the body.
Think of it as a malfunctioning volume control for pain. In fibromyalgia, the brain's pain processing system is turned up too high — stimuli that would normally cause no pain or mild discomfort are registered as severe pain. This is not imaginary; it is a measurable neurobiological phenomenon visible on functional MRI scans showing altered pain processing pathways in fibromyalgia patients.
Fibromyalgia affects women more commonly than men (approximately 7:1 ratio), though it occurs in men and children too. It frequently co-exists with other conditions including rheumatoid arthritis, lupus, osteoarthritis, and irritable bowel syndrome.
Symptoms of Fibromyalgia
Fibromyalgia produces a characteristic cluster of symptoms — though their severity and combination vary significantly between individuals.
Core symptoms:
Widespread chronic pain
The hallmark of fibromyalgia. Pain is described as aching, burning, throbbing, or a deep persistent soreness — affecting muscles, joints, and soft tissue throughout the body. It is bilateral (both sides of the body) and present above and below the waist. Pain intensity fluctuates and is often worsened by physical activity, cold, stress, and poor sleep.
Fatigue
Profound, persistent fatigue that is not relieved by rest or sleep. Many patients describe waking from a full night's sleep feeling as though they have not slept at all. Fatigue in fibromyalgia is qualitatively different from ordinary tiredness — it is disabling and significantly impacts functioning.
Sleep disturbance
Difficulty falling asleep, frequent night waking, and non-restorative sleep are nearly universal in fibromyalgia. Research has shown specific abnormalities in sleep architecture — particularly intrusion of alpha waves (associated with wakefulness) into deep slow-wave sleep (delta sleep). Poor sleep worsens pain, which in turn worsens sleep — a self-reinforcing cycle central to fibromyalgia.
Cognitive difficulties (Fibro Fog)
Difficulties with memory, concentration, word-finding, and mental clarity — commonly called "fibro fog." This can be as disabling as the physical pain for many patients.
Additional common symptoms:
Headaches and migraines
Irritable bowel syndrome (IBS) — present in approximately 50–70% of fibromyalgia patients
Restless legs syndrome
Heightened sensitivity to touch, temperature, light, and sound (allodynia and hyperalgesia)
Anxiety and depression — very common; partly consequence of chronic pain, partly shared neurobiological mechanisms
Temporomandibular joint (TMJ) pain
Bladder sensitivity (interstitial cystitis)
What Causes Fibromyalgia?
The exact cause of fibromyalgia remains incompletely understood, but research has identified several contributing factors:
Central sensitisation
The primary mechanism — the central nervous system becomes hypersensitised to pain signals. Levels of substance P (a pain-amplifying neurotransmitter) are elevated in fibromyalgia patients' cerebrospinal fluid. Levels of serotonin and norepinephrine — neurotransmitters involved in pain inhibition — are reduced.
Triggering events
Fibromyalgia often develops or worsens after a triggering event:
Physical trauma — car accidents, injuries, surgery
Infections — some patients develop fibromyalgia following viral illnesses
Severe psychological stress — bereavement, abuse, post-traumatic stress
Other chronic pain conditions — RA, lupus, and other inflammatory conditions can trigger fibromyalgia
Genetic factors
Fibromyalgia runs in families — first-degree relatives of fibromyalgia patients are at significantly higher risk. Several genetic variants affecting serotonin and dopamine pathways have been identified.
Sleep abnormalities
Poor deep sleep itself contributes to fibromyalgia development — studies experimentally depriving healthy volunteers of slow-wave sleep produced fibromyalgia-like symptoms.
How is Fibromyalgia Diagnosed?
For many years, fibromyalgia was diagnosed using the "tender points" criteria — 11 of 18 specific body locations had to be painful on digital pressure. This approach has been replaced.
Current diagnostic criteria (ACR 2010/2016):
Fibromyalgia is now diagnosed based on:
1. Widespread Pain Index (WPI)
scoring the number of areas that have been painful in the past week from a defined list of 19 body regions
2. Symptom Severity Scale (SSS)
scoring fatigue, waking unrefreshed, and cognitive symptoms on a 0–3 scale, plus other somatic symptoms
3. Duration
symptoms present for at least 3 months
4. Exclusion
another diagnosis does not better explain the symptoms
Importantly, fibromyalgia does not show up on standard blood tests or X-rays — there is no biomarker. ANA, RF, CRP, and inflammatory markers are typically normal. This is one reason it is misdiagnosed so frequently — doctors can dismiss it when tests are normal, not recognising that normal results are consistent with a fibromyalgia diagnosis.
Fibromyalgia can and does coexist with other conditions (RA, lupus, etc.) — having another diagnosis does not exclude fibromyalgia.
Treatment Options for Fibromyalgia
Treatment of fibromyalgia requires a multimodal approach — no single treatment works for everyone, and the best outcomes come from combining several strategies simultaneously.
1. FDA-Approved Medicines for Fibromyalgia
Three medicines are specifically FDA-approved for fibromyalgia treatment:
Pregabalin (Lyrica) — the first FDA-approved fibromyalgia medicine (2007)
Pregabalin works by binding to calcium channels in the central nervous system, reducing the release of excitatory neurotransmitters involved in pain amplification — directly targeting the central sensitisation mechanism of fibromyalgia.
Clinical trials showed Pregabalin significantly reduced pain scores, improved sleep quality, and reduced fatigue in fibromyalgia patients compared to placebo.
Typical dose: 75mg twice daily, increasing to 150–225mg twice daily based on response and tolerance. The most common side effects are dizziness and drowsiness — usually most prominent in the first 1–2 weeks.
At TheMedicineKart, we stock generic [Pregabalin 300mg tablets] at significant savings off branded Lyrica. For full Pregabalin details, see our complete [Pregabalin Guide].
Duloxetine (Cymbalta)
A serotonin-norepinephrine reuptake inhibitor (SNRI) that increases the levels of both serotonin and norepinephrine in the central nervous system — restoring the pain-inhibiting pathways that are deficient in fibromyalgia. Also has antidepressant and anti-anxiety effects, addressing the mood components that frequently accompany fibromyalgia.
Milnacipran (Savella)
Another SNRI specifically approved for fibromyalgia in the USA. Similar mechanism to duloxetine but with a relatively greater effect on norepinephrine reuptake.
2. Medicines Used Off-Label
Tricyclic antidepressants (Amitriptyline)
Low-dose amitriptyline (10–50mg at bedtime) improves sleep quality, reduces pain, and reduces fatigue in fibromyalgia — often used as a first step before or alongside the FDA-approved medicines. Not FDA-approved for fibromyalgia specifically but supported by clinical evidence.
Gabapentin
A related gabapentinoid to Pregabalin, used off-label with similar (though generally less consistent) effects.
Tramadol
A weak opioid with norepinephrine/serotonin reuptake properties. Used short-term for pain management. Standard opioids (codeine, oxycodone) are generally not recommended for fibromyalgia — they do not address central sensitisation and carry dependency risk.
SSRIs (Fluoxetine, Sertraline)
Useful for depression and anxiety comorbidities; some benefit for fibromyalgia symptoms themselves, particularly when combined with tricyclics.
3. Exercise — The Single Most Evidence-Backed Intervention
Multiple meta-analyses confirm that aerobic exercise is the most consistently effective long-term treatment for fibromyalgia — more effective than any single medicine for improving pain, fatigue, and function over time.
The challenge: Exercise can initially worsen pain in fibromyalgia patients, leading many to avoid it. The key is to start at very low intensity and progress extremely gradually — a process called graded exercise therapy (GET).
Recommended approach:
Start with 5–10 minutes of low-impact activity (walking, swimming, cycling) every other day
Increase by 1–2 minutes per session every 1–2 weeks
Work up to 30 minutes of moderate aerobic exercise 3–5 times per week over several months
Water-based exercise (hydrotherapy/aquatherapy) is particularly well-tolerated in fibromyalgia and is an excellent starting point for those who find land-based exercise too painful.
4. Cognitive Behavioural Therapy (CBT)
CBT adapted for chronic pain — addressing pain catastrophising, fear-avoidance behaviour, and activity patterns — has strong evidence for improving function and quality of life in fibromyalgia. It does not cure the pain but changes the relationship the patient has with their pain, enabling better functioning.
5. Sleep Optimisation
Given that poor sleep both causes and worsens fibromyalgia symptoms, sleep management is central to treatment:
Consistent sleep and wake times
Sleep hygiene measures
Treatment of specific sleep disorders (sleep apnea, restless legs) if present
Low-dose amitriptyline specifically improves the deep sleep disruption characteristic of fibromyalgia
6. Multidisciplinary Pain Management
For severe or treatment-resistant fibromyalgia, multidisciplinary pain management programmes — combining medical management, psychology, physiotherapy, and occupational therapy — produce the best long-term outcomes.
Fibromyalgia vs Other Conditions: Key Distinctions
Feature | Fibromyalgia | Rheumatoid Arthritis (RA) | Lupus (SLE) |
Cause | Central sensitization and altered pain processing | Autoimmune inflammation of the joints | Systemic autoimmune disease affecting multiple organs |
Blood Tests | Typically normal | Rheumatoid factor (RF) and anti-CCP antibodies often positive | ANA and anti-dsDNA antibodies often positive |
Joint Damage | No structural joint damage | Yes — can cause erosions and permanent joint damage | May cause joint inflammation; organ damage (e.g., kidneys, skin, nervous system) is more characteristic |
Fatigue | Severe and common | Moderate to severe | Severe and common |
Primary Treatment | Exercise, cognitive behavioral therapy (CBT), and medications such as pregabalin or duloxetine | Disease-modifying antirheumatic drugs (DMARDs), such as methotrexate and hydroxychloroquine | Hydroxychloroquine and other immunomodulatory therapies depending on organ involvement |
Can Coexist with Other Conditions? | Yes — may coexist with RA, lupus, or osteoarthritis | Yes — can coexist with fibromyalgia | Yes — can coexist with fibromyalgia |
Frequently Asked Questions
Is fibromyalgia a real condition?
Yes. Fibromyalgia is a recognised neurological condition involving measurable changes in central pain processing. The stigma that it is "all in the mind" or purely psychological has been comprehensively disproven by neuroimaging, cerebrospinal fluid analysis, and decades of clinical research. Three FDA-approved medicines exist specifically for its treatment.
What is the best medicine for fibromyalgia?
No single medicine works best for all patients. Pregabalin, Duloxetine, and Milnacipran are the three FDA-approved options. Low-dose amitriptyline at bedtime is also widely used with good evidence. Most patients benefit most from combining medicine with aerobic exercise and, where available, CBT.
Can fibromyalgia be cured?
There is no cure for fibromyalgia. However, many patients achieve significant reduction in symptoms and improvement in function with appropriate multimodal treatment. Some patients enter prolonged periods of low symptoms. The condition tends to be lifelong but its severity can be substantially reduced with the right approach.
Does fibromyalgia get worse over time?
Not necessarily. Fibromyalgia does not cause progressive joint or organ damage. With appropriate treatment — particularly regular aerobic exercise and evidence-based medicines — many patients improve over time. However, ongoing poor sleep, inactivity, and psychological stress tend to worsen symptoms.
What triggers a fibromyalgia flare?
Common triggers include: poor sleep, physical overexertion, emotional stress, cold and damp weather, illness or infection, and hormonal changes. Identifying and managing personal triggers through a symptom diary is a valuable self-management strategy.
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