Last week, we explored the question “What is pain?”
This week, we’re addressing an equally important question:
Why does my body perceive pain the way it does?
Understanding how pain works can be incredibly empowering — especially for people living with chronic pain. Pain is not just a message from injured tissue. It is a protective signal created and regulated by the nervous system.
Pain Is a Nervous System Response
Pain can be understood as a decision made by the nervous system to alert us that something may need attention or protection. When the nervous system senses danger, it turns up the volume on sensation.
This is helpful when you’re injured and need to rest or protect your body.
It becomes problematic when the alarm system stays on long after healing should have occurred.
When that happens, pain:
feels more intense
lasts longer
spreads more easily
This can occur even when tissue damage has not increased.
Why Tension, Fear, and Resistance Amplify Pain
Three key factors are known to amplify pain signaling:
- Tension
- Fear
- Resistance or avoidance
All three increase nervous system threat detection and reduce the brain’s ability to dampen pain signals (often called pain inhibition).
How Muscle Tension Maintains Pain
When the body perceives threat, muscles tighten reflexively to protect vulnerable areas. While this is adaptive in the short term, chronic muscle tension can increase pain.
Sustained tension:
- reduces blood flow
- limits oxygen delivery
- increases metabolic waste
These changes activate nociceptors (pain receptors), sending more pain signals back to the brain.
This creates a self-reinforcing loop:
More pain → more guarding → more tension → more pain
Importantly, tension does not just result from pain — it also maintains pain.
When muscles soften, even slightly, the nervous system receives a message of safety, which can help reduce pain intensity.
How Fear Increases Pain Sensitivity
Fear activates the body’s threat system, including the sympathetic nervous system and limbic brain. When the brain perceives danger:
- pain sensitivity increases
- the pain threshold decreases
- survival becomes the priority over comfort
When this state persists, it can lead to central sensitization, where the nervous system becomes overly reactive to pain signals.
A helpful way to think about this is:
If the brain thinks you’re in danger, it wants you to feel it.
Research shows that pain intensity often correlates more strongly with fear and catastrophic thinking than with findings on imaging studies.
Catastrophizing Thoughts and Chronic Pain
In cognitive behavioral therapy (CBT), we often address catastrophizing thoughts such as:
- “This pain means I’m permanently damaged.”
- “It’s only going to get worse.”
- “I’ll never live a normal life.”
- “This flare means I’ve lost all my progress.”
- “If I move, I’ll injure myself further.”
- “My body is failing me.”
These thoughts are understandable — but they increase fear and nervous system activation, which can worsen pain.
CBT helps by identifying and challenging these thoughts, replacing them with more balanced and accurate ones.
In acceptance and commitment therapy (ACT), the focus shifts slightly. Instead of debating whether a thought is true, we ask whether it is helpful. If a thought pulls us away from what matters, we practice letting it be and choosing actions aligned with our values.
How Resistance Keeps the Pain Alarm On
Resistance to pain often looks like:
- bracing or guarding
- holding the breath
- tightening against sensation
- mentally trying to push pain away
Neurologically, resistance:
- increases sympathetic arousal
- keeps cortisol and adrenaline elevated
- reduces parasympathetic (vagal) tone
This suppresses the brain’s natural pain-inhibiting pathways and keeps the nervous system in an alert, defensive state.
In short, resistance tells the nervous system:
This is not safe.
This helps explain why pain can persist after healing, flare during stress, or spread to new areas.
Turning the Pain Volume Down
Pain is not a personal failure. It is adaptive biology — a protective system designed to keep us safe.
With chronic pain, however, the alarm is often louder than necessary. The goal of therapy is not to eliminate pain entirely, but to help the nervous system feel safe enough to turn the volume down.
Through mindfulness, gentle movement, cognitive strategies, and values-based action, we reduce tension, fear, and resistance — creating the conditions for pain to soften.
Key Takeaway
Pain is not just about damage.
It is also about protection, perception, and nervous system safety.
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