Post: What Is Central Sensitisation? Why Your Pain Doesn’t Always Match Your Injury

What Is Central Sensitization, Really?

Let me start simple. Your nervous system has a job: protect you from danger. Normally, it only sounds the alarm when there’s real damage. But sometimes, that alarm system gets stuck on high. This is called central sensitization. Your brain and spinal cord start amplifying every signal they receive. Touches that shouldn’t hurt suddenly do. Old injuries keep aching long after they’ve healed. Researchers describe this as your central nervous system becoming “hyperexcitable.” It reacts faster and harder than it should. This pattern shows up in real patients with back pain, headache, abdominal pain, and fatigue. Often, no single diagnosis explains all of it.

Think of your nervous system like a smoke alarm in your kitchen. A working alarm goes off when there’s an actual fire. A sensitised alarm goes off when you simply make toast. The wiring isn’t broken. It’s just turned up too high. Recent research describes this process in more technical terms. Pain chronification involves persistent neuroinflammation, with activated glial cells and inflammatory chemicals driving sensitisation through changes in cell excitability. In plain English, your nervous system’s own support cells start fuelling the fire, even when the original injury is gone. On a cellular level, this involves extra signalling chemicals in your spinal cord. Nerve cells release more of a chemical called glutamate than normal. This makes the next nerve cell fire more easily, again and again.  Researchers call this synaptic plasticity, and it can outlast the original injury by months or even years.

When Your Dull Pain or Achy Pain Doesn’t Match Your Scan

This is the part that confuses people the most. You might have a dull, achy pain in your lower back. You go for an X-ray or an MRI, and it comes back clear. So why does it still hurt?  Central sensitisation helps explain this disconnect. Your pain isn’t “in your head”. It’s in how your nervous system is processing pain, not in your tissue. Persistent sensitisation can lead to two patterns. Hyperalgesia means you feel more pain than the stimulus should cause. Allodynia means that normally painless touch becomes painful.

Breaking it down into the simplest form. Central sensitisation doesn’t mean your pain is imaginary. It also doesn’t mean every ache you feel is centrally driven. Some pain comes from a fresh injury. Some comes from inflammation you can see on a scan. Central sensitisation usually shows up in pain that lingers, spreads, or feels disproportionate to what caused it. A good clinician should always rule out serious causes first before considering this explanation.

How Stress Turns Up Your Pain Dial

Here’s where stress fits into your pain story. Your body has a stress response system called the HPA axis. It releases cortisol, your main stress hormone, when you’re under pressure. A little stress, now and then, is normal and even useful. But chronic stress keeps this system switched on for too long. Chronic stress hyperactivates the HPA axis. This raises cortisol and inflammatory chemicals in your body. These chemicals sensitise support cells in your nervous system, making central sensitisation worse.

This creates a frustrating loop. Your pain raises your stress. Your stress then raises your pain sensitivity. Round and round it goes. One recent study looked at this connection in people with chronic low back pain. It linked central sensitisation severity directly to dysregulation in stress hormone systems. This doesn’t mean stress causes your injury. It means stress can turn the volume up on the pain you’re already feeling.

Tight Muscles, Proprioception, and Losing Track of Your Body

You might notice your muscles feel tight, even when you stretch them often. This tightness is sometimes your nervous system’s way of guarding you. It’s not always about a shortened muscle fiber. It can be about protection. Central sensitisation also affects proprioception, your sense of where your body is in space. Researchers studying low back pain confirmed this link. Body perception disturbance was associated with central sensitisation, separate from how a person’s pain was otherwise classified.

This matters in clinic. When you’ve lost track of how your spine moves, you tend to move less, brace more, and feel tighter overall. Tightness, achy pain, and poor proprioception often travel together. They feed into each other in ways that pure stretching alone won’t fix.

Why Movement and Strength Training Help Calm Your Nervous System

Here’s some genuinely good news. Movement can help retrain a sensitised nervous system. A 2024 review pooled multiple studies on exercise and central sensitisation measures. It found that physical exercise may have a positive effect on central sensitisation in people with chronic neck pain. Not everyone responds the same way, though.

Strength training specifically has shown promise too. One study tracked people with chronic low back pain through twelve weeks of high-intensity training. Six months later, their central sensitisation symptoms had dropped meaningfully. This was especially true for those who started with the highest scores. Their perceived stress scores improved as well. This tells me something important: the right dose of strength training doesn’t just build muscle. It can help quiet an overactive nervous system at the same time.

I do want to flag a limitation here, because honesty matters more than a tidy story. Not everyone with central sensitisation responds the same way to exercise. Some people are “responders” and some aren’t, and researchers still don’t fully understand why. This is exactly why your movement plan needs to be dosed for you, not copied from someone else’s program.

This matters most after an injury. Many people stay still out of fear, worried that movement means more damage. Avoiding movement for too long can make a sensitised nervous system worse, not better.

How I Use a Multimodal Chiropractic Approach to Help You Move Better

This is where chiropractic care fits into the picture. I don’t believe in one tool for every problem. A multimodal approach combines soft tissue therapy, adjustments, and prescribed exercise. This combination has evidence behind it for improving movement and reducing pain sensitivity. Manual therapy techniques have been shown to meaningfully change how the nervous system processes pain. Researchers measured this through pressure pain thresholds in clinical studies.

A 2024 randomised trial compared three approaches for chronic low back pain. These were exercise alone, exercise with kinesiology tape, and exercise combined with manual therapy. The group receiving manual therapy before their exercises improved their disability scores fastest, showing meaningful gains within just three weeks. I want to flag this study’s honest limit too. It didn’t find a statistically significant difference in pain sensitivity between groups. The sample size was also fairly modest. The combined approach sped up functional recovery. It didn’t prove a unique biological effect on central sensitisation itself in this particular trial.

This is exactly why I see my role as more than just delivering an adjustment. Part of my job as your chiropractor is prescribing the right exercise dosage. This needs to fit your nervous system, not a generic plan. Too little movement won’t desensitise anything. Too much, too soon, can flare your symptoms further. Soft tissue work and adjustments can reduce guarding and tightness, creating a window where movement feels safer. Then, the right strength training dose helps consolidate that progress over time. This combination, hands-on care plus carefully dosed movement, is how I try to help. Not just the painful spot, but your whole system.