Fibromyalgia: Symptoms, Diagnosis, and Evidence-Based Treatment

Fibromyalgia: Symptoms, Diagnosis, and Treatment

Fibromyalgia is a chronic pain condition characterized by widespread musculoskeletal pain, fatigue, sleep problems, and cognitive difficulties. It affects approximately 4 million Americans (2% of the adult population) and is 2-3 times more common in women.

What Is Fibromyalgia?

Fibromyalgia is now understood as a disorder of central pain processing — the brain and spinal cord amplify pain signals, causing normally non-painful sensations to be perceived as painful (central sensitization). It is not a disease of the muscles, joints, or connective tissue.

Symptoms

Core symptoms:

• Widespread pain (both sides of the body, above and below the waist) lasting 3+ months
• Fatigue that is not relieved by rest
• Sleep disturbances (non-restorative sleep, frequent waking)
• Cognitive difficulties ("fibro fog") — problems with memory, concentration, and word-finding

Associated symptoms:

• Headaches and migraines
• Irritable bowel syndrome (IBS) — affects 30-70% of fibromyalgia patients
• Temporomandibular joint (TMJ) disorder
• Anxiety and depression
• Restless legs syndrome
• Heightened sensitivity to light, sound, smell, and temperature

Diagnosis

There is no blood test or imaging study that diagnoses fibromyalgia. Diagnosis is clinical, based on:

2016 ACR Diagnostic Criteria:

1. Widespread pain index (WPI) ≥ 7 AND symptom severity scale (SSS) ≥ 5, OR WPI 4-6 AND SSS ≥ 9
2. Symptoms present at a similar level for at least 3 months
3. No other disorder that would explain the pain

Blood tests are used to rule out other conditions (thyroid disease, lupus, rheumatoid arthritis, vitamin D deficiency).

Treatment: Evidence-Based Approach

Multimodal treatment (combining several approaches) is most effective.

Exercise (strongest evidence):

Aerobic exercise is the single most evidence-based treatment for fibromyalgia. Start low, go slow — begin with 5-10 minutes of walking and gradually increase. Aquatic exercise is particularly well-tolerated.

Cognitive Behavioral Therapy (CBT):

Addresses the psychological component of pain amplification. Reduces pain catastrophizing and improves function.

Medications:

• Duloxetine (Cymbalta) — FDA-approved; SNR inhibitor; reduces pain and fatigue
• Milnacipran (Savella) — FDA-approved; SNRI
• Pregabalin (Lyrica) — FDA-approved; reduces central sensitization
• Low-dose tricyclic antidepressants (amitriptyline) — improves sleep and pain
• Note: Opioids are NOT recommended for fibromyalgia — they worsen central sensitization

Sleep improvement:

Treating non-restorative sleep often improves pain. Low-dose amitriptyline or cyclobenzaprine at bedtime can help.

Complementary approaches with evidence:

• Mindfulness-based stress reduction (MBSR)
• Tai chi (multiple RCTs show benefit)
• Acupuncture (modest benefit)

Medical Disclaimer

Fibromyalgia diagnosis and management should involve a rheumatologist, physiatrist, or pain specialist. A multidisciplinary approach yields the best outcomes.