Understanding Pain Sensitisation Theory: Why Some Pain Lasts Longer Than It Should

Pain is meant to protect us. It’s our body’s way of saying, “Hey, something’s wrong, pay attention!” But what happens when pain persists long after an injury has healed, or when pain arises without any clear physical cause? This is where Pain Sensitisation Theory comes in. Pain sensitisation refers to changes in the nervous system that make pain signals more intense, prolonged, or easily triggered. This can happen at two levels:

1. Peripheral Sensitisation – When nerves at the site of injury become more reactive, leading to increased pain signals sent to the brain.
2. Central Sensitisation – When the brain and spinal cord become more sensitive to pain signals, even interpreting non-painful stimuli (like light touch) as painful.

Pain sensitisation can develop due to:

• Chronic pain conditions (e.g., fibromyalgia, complex regional pain syndrome, chronic fatigue syndrome)
• Repeated injury or inflammation
• Emotional distress, anxiety, or trauma
• Nervous system dysregulation from long-term stress

Essentially, the nervous system “learns” pain. Just as we get better at riding a bike with practice, our nervous system can become more efficient at producing pain—even when it’s no longer helpful.
Pain isn’t just a physical sensation; it’s deeply influenced by thoughts, emotions, and past experiences. Psychological factors can either amplify or reduce pain perception. Here’s how:

• Catastrophising (expecting the worst) can increase pain sensitivity.
• Anxiety and fear can keep the nervous system in a hyper-alert state, heightening pain.
• Past trauma can make the brain more reactive to pain signals.
• Mindfulness, relaxation, and cognitive-behavioral strategies can help “rewire” the brain to reduce pain perception.

In summary, pain sensitisation is real, and it’s not “just in your head.” It’s a genuine nervous system response that can be reshaped with the right strategies. Understanding this theory can help people move from feeling trapped by their pain to regaining a sense of control over their bodies and their lives.
For a more comprehensive guide to explain the science of pain, Explain Pain by David S. Butler and Lorimer Moseley's book is a great resource.