When pain becomes a learned skill in the brain

The physio cleared you six months ago. The MRI is clean. But the ache in your knee persists, a dull throb that sharpens on damp mornings. You’re a runner, a cyclist, an athlete—your body is your instrument, and now it feels like it’s playing a song you don’t recognise. I used to see this pattern as a stubborn injury that refused to heal. That was before I understood the pain wasn't coming from the tissue anymore. The broadcast station had moved. The feeling is the low-grade vigilance, the constant internal negotiation before a training session, the exhaustion that settles in long after you’ve stopped moving. It’s the particular dread of a humid Mumbai afternoon, knowing the familiar static will return. This is the signature of a nervous system running a learned pain programme.

Pain as a learned broadcast

Your nervous system’s job is to keep you safe. When you sustain an injury, pain is a useful, necessary signal: "Stop! There is damage here. Protect this area." Nerves in the tissue send alerts up the spinal cord to the brain. With a persistent injury, or under high physiological and psychological load, the neurons that form this pain pathway can become more excitable. This is called central sensitisation.

Think of it as a change in operating procedure. The neurons that form the pain pathway—from the nerve endings, up the spinal cord, and into the brain—become more efficient. They install more receptors, which act like hair-triggers for the pain alarm. The system becomes so good at sounding the alert that it needs less and less input to set it off. A gentle stretch, a change in air pressure, a stressful thought—any of these can now be enough to trigger the broadcast.

This process is a physical remodelling of your spinal cord and brain. In the dorsal horn of your spinal cord—a key relay station for sensory information—neurons that carry pain signals become hyper-responsive. They are flooded with the excitatory neurotransmitter glutamate. Meanwhile, supportive cells called microglia and astrocytes, once thought to be simple 'glue', shift from a housekeeping role to an active pro-inflammatory state. They release chemicals that further sensitise the neurons, effectively turning up the volume knob on any incoming signal. The system gets stuck in a feedback loop where pain begets more sensitivity to pain.

It’s like a faulty radio receiver that’s become hyper-sensitive. At first, it only picked up the strong, clear signal of the initial injury. Now, it blasts static in response to almost anything. The original broadcast from the injured tissue has long since gone off-air, but your nervous system is still playing the static at full volume. The pain you feel is real; its source has simply moved from the tissue to the processing centres in your brain and spinal cord. The work is not to fix the tissue again, but to retune the receiver.

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The uncounted load on the female athlete

The conversation about central sensitisation often ignores a critical variable: hormones. The specific load of the hormonal cycle is frequently overlooked, filed away as a complication rather than treated as a core operating system. The menstrual cycle is a fundamental rhythm that changes the baseline conditions for everything, including pain perception, inflammation, and neurotransmitter levels. Estradiol, for example, has neuroprotective and anti-inflammatory effects. When its levels fluctuate throughout the month, so does your baseline resilience to pain and stress.

This hormonal reality is compounded by cumulative load. Estradiol modulates the activity of GABA, the brain's primary inhibitory neurotransmitter, which helps to keep neuronal firing in check. When estradiol drops, it's like turning down the dimmer on this calming influence, making the nervous system more susceptible to excitatory inputs, including pain. Progesterone has similar calming, GABA-ergic effects. The cyclical nature of these hormones means a female athlete's baseline for pain processing is a moving target, yet her training plan likely treats her body as a constant.

For an athlete, chronic stress manifests as the physiological fallout from consistent under-fuelling, inadequate sleep, the pressure to perform, and the social expectation to be tough. Each of these depletes the resources the nervous system needs to regulate itself. When the system is already running hot, it has less bandwidth to manage pain signals effectively. A female athlete's nervous system is often trying to manage pain with depleted reserves, while also being told those reserves are imaginary. The establishment asking you to document your pain is the same one that refuses to fund the research that would explain it.

Retuning the pain signal

A learned pattern can be unlearned. Since the problem is in the processing, the solution is to change the input. You can't argue with the radio static, but you can change the station. This requires deliberately feeding your nervous system new, high-quality, non-threatening information.

Start with sensation. Your brain’s map of your body can get smudged and distorted by chronic pain. The area feels like a threat zone, a blurry part of the map marked 'here be dragons'. I find the most reliable starting point is bringing high-definition, safe sensation back to that area. Use a soft brush or your fingertips to gently stroke the skin around the painful area. Pay close attention to the feeling. Is it warm? Cool? Smooth? Tingly? The goal here is not repair, but sensory information. You are simply updating the brain’s map, reminding it that this part of the body can experience things other than pain.

Build interoceptive accuracy. Interoception is your ability to sense the internal state of your body—your heart rate, your breath, the feeling of hunger or fatigue. Chronic pain scrambles this channel with static. Your brain, in an effort to protect you, starts to distrust all incoming data from the 'problem area'. It develops a negative prediction bias, assuming any sensation could be a precursor to pain. This is why even a neutral feeling, like the brush of clothing, can feel vaguely threatening. The work is to clean up this channel and improve its signal-to-noise ratio. This is different from just noticing sensation; it's about accurately mapping it and recalibrating the brain's expectations. You are rebuilding the brain's trust in its own sensory intelligence.

Move without a threat agenda. The next step is graded exposure. Your brain has learned to associate certain movements with a threat. The goal is to break this association by providing contrary evidence. If your brain predicts that bending your knee 30 degrees will cause a 7/10 pain, you bend it 5 degrees, with zero pain. The brain’s prediction was wrong. This is a critical moment. You are creating a prediction error. By slowly and gently increasing the range of motion, always staying below the threshold of pain, you are systematically proving the brain’s threat assessment wrong. Over time, the brain updates its model. It learns that the movement is safe. This is the principle behind practices like how to reintegrate movement after injury.

Find the off-switch. Central sensitisation is a state of being stuck 'on'. To unlearn it, you need to practise being 'off'. This means actively engaging your parasympathetic nervous system, the body's braking system. The most direct way to do this is with your breath. A physiological sigh—a double inhale through the nose followed by a long, slow exhale through the mouth—is one of the fastest ways to do this. It mechanically re-inflates collapsed alveoli in the lungs and signals to the vagus nerve that it's safe to stand down. Three of these sighs can shift your state in under a minute. It is a mechanical intervention that changes the physiological weather.

Common Questions

Is central sensitisation the same as saying the pain is 'all in my head'?

No. It means the pain is in your nervous system. The pain is a real, physiological experience generated by your brain and spinal cord. The location of the problem is the processing, not your imagination or a failure of character. The signal is real; the source has just moved.

Why does the pain feel worse when I'm stressed or tired?

Your stress response system and your pain pathways are deeply interconnected and use some of the same wiring. Stress hormones like cortisol can increase inflammation and make neurons in your pain pathways more sensitive. A tired system has less capacity to regulate and dampen down these signals, so the background static of the pain becomes the dominant sound.

Can this learned pain ever be unlearned?

Yes. The brain's ability to change is called neuroplasticity, and it works both ways. Through targeted sensory inputs, gentle movement, and nervous system regulation practices, you can teach the brain new patterns. It requires consistency and patience, but you can effectively 'turn down the volume' on chronic pain signals by providing the system with new evidence of safety.

What’s the difference between this and the pain from a new injury?

Acute pain from a new injury is a direct and proportional signal from damaged tissue. It’s a useful alarm that tells you to stop, rest, and protect the area. Centralised pain is the alarm system itself malfunctioning. The signal is disproportionate to any tissue state, often occurring without any new injury or provocation. It's the difference between a fire alarm going off because there's a fire, and one that goes off every time someone makes toast.

Closing

Understanding the mechanism is the first step. The next is to begin deliberately sending your nervous system new, safer signals.

• Ready to retrain your nervous system? The Kokorology Practice is a library of tools for just that.
• For a personalised map of your own nervous system patterns, book a 1:1 State Audit.
• Start with the basics. Download the free Nervous System Primer to understand your state.

TL;DR

Persistent pain in female athletes often reflects a learned pattern in the central nervous system called central sensitisation, where the brain becomes overly efficient at creating the pain experience. The unique physiological loads of the female hormonal cycle, compounded by a sports science model that overlooks female physiology, can amplify this. Unlearning this pain involves retraining the nervous system with gentle, safe movements and down-regulating practices. These methods provide the brain with new evidence that movement is no longer a threat, effectively turning down the volume on pain signals.

Sources

• Patel S, Holden P, Stirling AE, et al. (2024). Time to look beyond the tissues: a new lens for understanding pain in female athletes. British Journal of Sports Medicine.
• Sims ST. (2023). Fuelling the female athlete: Auditing her representation in the sports nutrition literature and identifying future research directions. Sports Medicine.
• Khalsa SS, Adolphs R, Cameron OG, et al. (2018). The Current State of Interoception Research: A Clinical Neuroscience Perspective. The Journal of Neuroscience.
• McEwen BS. (2019). The brain on stress: toward an integrative approach to vulnerability and resilience. The American Journal of Psychiatry.
• Balban MY, et al. (2023). Brief structured respiration practices enhance mood and reduce physiological arousal. Cell Reports Medicine.