If you’ve been told “there’s nothing wrong” after yet another normal test result, but you’re still living with relentless pain throughout your body, you’re not imagining it. Your chronic pain is absolutely real—and there’s a neurological explanation for why it persists long after any original injury has healed. The answer lies in a process called central sensitization, where your nervous system essentially turns up the volume on pain signals, making your brain and spinal cord hypersensitive to sensations that shouldn’t hurt. This mechanism is now recognized as a key driver of fibromyalgia and chronic migraine, two conditions that affect thousands of people right here in Central Washington.
What Is Central Sensitization?
Central sensitization happens when your central nervous system—your brain and spinal cord—becomes amplified in how it processes pain signals. Think of it like a volume dial that’s been cranked up too high and then gets stuck there. Normally, your nervous system accurately interprets signals from your body: a light touch feels gentle, moderate pressure feels firm, and actual tissue damage triggers protective pain. But with central sensitization, that dial is turned way up. A gentle touch might register as painful pressure. Normal muscle tension might feel like burning. Even mundane activities like showering or wearing clothes can become uncomfortable (Cagnie et al., 2014).
This isn’t a psychological issue or “pain in your head” in the way people sometimes dismissively suggest. Research using brain imaging has shown actual structural and functional changes in the brains of people with fibromyalgia and chronic migraine. Studies have found decreased gray matter volume in specific brain regions involved in pain processing, along with altered connectivity in the neural pathways that normally help dampen pain signals (Cagnie et al., 2014). Your nervous system has physically changed how it processes sensory information.
How Central Sensitization Develops in Fibromyalgia
Fibromyalgia affects somewhere between 1% to 5% of the U.S. population, with many of those patients concentrated in areas like the Tri-Cities where access to specialized pain care has historically been limited. The condition is characterized by widespread musculoskeletal pain without clear physical findings on standard tests—no inflammation markers in bloodwork, no visible damage on imaging. For years, this led to patients being dismissed or misdiagnosed.
We now understand that fibromyalgia involves profound changes in how nociceptors—pain-sensing nerve endings—function in the skin and muscles. These receptors become sensitized through mechanisms that aren’t fully understood but likely involve stress, trauma, viral infections, or genetic predisposition. Once sensitized, they send amplified danger signals to the spinal cord and brain. The brain’s descending pain-modulating systems, which normally help suppress unnecessary pain signals, become dysfunctional. Instead of calming things down, they paradoxically enhance the pain (Cagnie et al., 2014).
This creates a self-perpetuating cycle. Chronic pain itself causes stress, poor sleep, and emotional distress. These factors further dysregulate the nervous system, leading to more sensitization. Before long, patients develop allodynia—where even light pressure causes pain—and hyperalgesia, where mildly painful things feel excruciating.
The Role of Central Sensitization in Chronic Migraine
Chronic migraine, defined as headache occurring 15 or more days per month, affects approximately 3% of the general population. Many people start with episodic migraines that gradually transform into chronic daily headaches. At Tri-Cities Infusion and Wellness Clinic, we see this progression frequently in our Central Washington community—people who started with occasional migraines that slowly took over their lives.
The transformation from episodic to chronic migraine involves sensitization of the trigeminovascular system, the network of nerves that surrounds blood vessels in your head and face. During a migraine attack, these nerves become activated and release inflammatory substances. With repeated attacks, the neurons in your brainstem that process these signals become hypersensitive (Suzuki et al., 2022).
Research shows that patients with chronic migraine have significantly higher scores on measures of central sensitization compared to those with episodic migraines or healthy controls. They’re more likely to experience cutaneous allodynia—where combing your hair, wearing glasses, or even lying on a pillow becomes painful (Su & Yu, 2018). Studies have also identified structural brain changes in chronic migraine patients, particularly in areas responsible for pain modulation. The periaqueductal gray (PAG) and rostral ventromedial medulla, brain regions that should help inhibit pain, instead become dysfunctional and actually facilitate it (Su & Yu, 2018).
What makes this particularly frustrating is that once central sensitization is established, typical migraine medications often lose their effectiveness. The window for acute treatment narrows because the nervous system is already in a heightened state.
Why Normal Tests Don’t Show Central Sensitization
This is one of the most invalidating aspects of living with fibromyalgia or chronic migraine. You know something is deeply wrong. You’re in pain every single day. But your bloodwork comes back normal. Your MRI shows nothing remarkable. Your physical exam doesn’t reveal obvious abnormalities. Healthcare providers may suggest it’s stress, anxiety, or depression—as if those diagnoses somehow mean the pain isn’t real or legitimate.
The truth is that standard medical tests aren’t designed to detect central sensitization. X-rays and MRIs look for structural damage to tissues. Blood tests check for inflammation markers or metabolic problems. But central sensitization is a functional change in how your nervous system processes information, not a structural lesion that shows up on a scan. Specialized research tools like quantitative sensory testing or functional brain imaging can demonstrate these changes, but they’re not part of routine clinical practice in most settings (Suzuki et al., 2022).
At our clinic in Kennewick, our team—led by certified registered nurse anesthetists Tyler Thornock and Ben Clark, who have provided thousands of anesthetics throughout the Tri-Cities and Yakima Valley—understands that negative test results don’t mean your pain isn’t real. They mean we need to look at the problem differently, recognizing that the issue lies in how your nervous system is processing signals rather than in damaged tissues.
What This Means for Treatment
Understanding central sensitization changes how we approach treatment for fibromyalgia and chronic migraine. If the problem is an overactive, hypersensitive nervous system, then treatments need to target those neural mechanisms rather than simply trying to reduce inflammation or repair tissue damage.
This is where newer treatment approaches come in. Therapies that modulate neurotransmitter systems in the brain and spinal cord—particularly those that work on NMDA receptors and glutamate, the main excitatory neurotransmitter involved in central sensitization—have shown promise in clinical research. The goal isn’t just to mask pain temporarily, but to help reset that overamplified nervous system back toward normal functioning.
Results vary by individual, and no treatment works for everyone. Some patients experience significant relief, while others see modest improvements. Patient autonomy remains central—you’re the expert on your own experience, and treatment decisions should be collaborative between you and your healthcare team.
Three Practical Steps You Can Take This Week
While central sensitization is complex, there are evidence-based strategies you can implement right away:
- Track Your Pain Patterns: Keep a simple journal noting your pain levels, sleep quality, stress levels, and activities for one week. Look for patterns. Does pain worsen with poor sleep? After stressful days? During certain activities? Understanding your triggers helps guide treatment decisions and gives your healthcare team valuable information.
- Prioritize Sleep Hygiene: Poor sleep both results from and contributes to central sensitization. This week, commit to a consistent sleep schedule—same bedtime and wake time, even on weekends. Keep your bedroom cool and dark. Avoid screens for an hour before bed. Sleep won’t cure chronic pain, but it can help reduce the nervous system’s reactivity.
- Practice Gentle Movement: Complete rest often worsens central sensitization. Even five to ten minutes of gentle stretching, walking, or tai chi can help. The key is consistency and avoiding the boom-bust cycle where you overdo it on good days and pay for it later. Start embarrassingly small—literally a five-minute walk around your Kennewick neighborhood—and build from there.
Finding Support in the Tri-Cities
Living with fibromyalgia or chronic migraine in Central Washington can feel isolating, but you’re not alone. Our clinic has helped patients throughout Kennewick, Richland, Pasco, and surrounding areas find relief and reclaim their lives. We offer free consultations to discuss your medical history, review what treatments you’ve already tried, and determine whether you might be a candidate for innovative approaches that specifically target central sensitization.
Tyler and Ben, along with our family nurse practitioners Michelle Perez and Cherry White, work closely with your existing healthcare team—your primary care provider and any mental health professionals you’re seeing. This collaborative approach ensures you receive comprehensive, coordinated care. We believe in treating the whole person, not just chasing symptoms.
If you’re ready to take back control of your life and start living again, we invite you to contact Tri-Cities Infusion and Wellness Clinic to schedule your free consultation. Our office focuses on being welcoming, relaxing, and comfortable, with private infusion rooms designed specifically for your comfort and safety.
References
Cagnie, B., Coppieters, I., Denecker, S., Six, J., Danneels, L., & Meeus, M. (2014). Central sensitization in fibromyalgia? A systematic review on structural and functional brain MRI. Seminars in Arthritis and Rheumatism, 44(1), 68-75. https://pubmed.ncbi.nlm.nih.gov/24508406/
Su, M., & Yu, S. (2018). Chronic migraine: A process of dysmodulation and sensitization. Molecular Pain, 14, 1-10. https://pmc.ncbi.nlm.nih.gov/articles/PMC5900816/
Suzuki, K., Suzuki, S., Shiina, T., Kobayashi, S., & Hirata, K. (2022). Central sensitization in migraine: A narrative review. Journal of Pain Research, 15, 2673-2682. https://pubmed.ncbi.nlm.nih.gov/36101891/
