If you've ever been told "pain is just the body's warning system, stop when it hurts," that advice has cost a lot of people a lot of unnecessary recovery time. Modern pain science is more nuanced — and more useful.

Pain is information. Sometimes it's a stop sign. More often, it's a dashboard light that tells you something needs attention, but not necessarily that you need to stop everything.

Pain is not a direct measure of tissue damage

One of the most consistent findings in modern pain science (Moseley & Butler, Explain Pain; Wall and the IASP definition) is that the intensity of pain does not directly correspond to the amount of tissue damage. Your nervous system weighs many inputs — mechanical, emotional, contextual, historical — before producing the experience of pain.

That doesn't mean pain isn't real. It absolutely is. It means pain isn't a perfect proxy for injury severity. A high-pain experience can come from a low-grade tissue issue when the nervous system is sensitized. A low-pain experience can come from a significant tissue injury when adrenaline or context dampens the signal.

The Silbernagel pain-monitoring model

For tendon injuries specifically, the Silbernagel research group developed a pain-monitoring approach that's now widely cited (Silbernagel et al., Am J Sports Med, 2007). The model uses three rules:

  1. Pain during loading up to about 5/10 is acceptable. It does not mean you are damaging tissue.
  2. Pain should not increase week over week. If you've been holding at a 4/10 during running for two weeks and it's now consistently 6/10, the load is too high.
  3. Pain after the session should subside by the next morning. Lingering, sharper pain into the next day suggests load exceeded capacity.

This framework was developed for Achilles tendinopathy but has been adapted for many other musculoskeletal conditions because the principle generalizes: monitor trend more than absolute number.

“Monitor the trend, not just today's number.”

A simple framework you can use today

For most non-emergency musculoskeletal pain, here's a practical decision tree:

Green light — load is appropriate

  • Pain during activity 3–4/10 maximum
  • Pain subsides within a few hours
  • Pain is the same or better next morning
  • Pain is the same or better week over week

Yellow light — investigate or modify

  • Pain during activity 5–6/10
  • Pain lingers into the evening
  • Slight increase week over week
  • You're protecting the area in daily movement

Red light — back off and assess

  • Pain > 7/10 during activity
  • Pain wakes you at night
  • Pain getting worse week over week despite rest
  • New neurological symptoms (numbness, weakness, radiating pain)
  • Pain associated with trauma you haven't had assessed
  • Locking, giving way, or true mechanical block in a joint

Pain signals you're not sure about?

An assessment can identify what your pain is telling you and what to do about it.

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Things that amplify pain (without changing tissue)

Pain is influenced by many non-tissue factors. Recognizing these doesn't dismiss pain — it puts it in context.

  • Sleep deprivation. Even a single night of poor sleep increases pain sensitivity (Krause et al., J Neurosci, 2019).
  • Stress and threat appraisal. The same stimulus is rated more painful when framed as threatening.
  • Inactivity and deconditioning. Detrained tissues are more pain-sensitive at lower loads.
  • Fear of movement. Kinesiophobia is a strong predictor of chronic pain outcomes (Vlaeyen and Linton's fear-avoidance model).

What about chronic pain?

For pain persisting beyond 3 months, the rules shift. Pain science education, graded exposure to feared movements, and gradual activity progression are core to evidence-based chronic pain management (Cochrane reviews on pain neuroscience education). Avoidance often makes chronic pain worse, not better.

Bottom line

Pain is information. Use the Silbernagel-style rules — up to about 4–5/10 during activity, no week-over-week escalation, no lingering pain past the next morning — as your baseline. Watch for true red flags (neurological symptoms, trauma, night pain, mechanical block). For everything else, expect that pain is something you can work with, not just around.

References

  1. Silbernagel KG, et al. Continued sports activity, using a pain-monitoring model, during rehabilitation in patients with Achilles tendinopathy. Am J Sports Med. 2007;35(6):897–906.
  2. Moseley GL, Butler DS. Explain Pain & The Explain Pain Handbook. Noigroup Publications.
  3. Vlaeyen JWS, Linton SJ. Fear-avoidance and its consequences in chronic musculoskeletal pain. Pain. 2000;85(3):317–332.
  4. Krause AJ, et al. The pain of sleep loss: a brain characterization in humans. J Neurosci. 2019;39(12):2291–2300.