No Longer Hurting Doesn't Mean You're Ready to Run Again

You haven’t run for three weeks. You’ve done as you were told, you’ve rested, and this morning you walk down the stairs without feeling a thing. No twinge in the tendon, no tightness in the knee. So you head out for an easy 40-minute run, without pushing it.

The next day, there it is again. In the same spot.

If this sounds familiar, it isn’t bad luck. It’s one of the most common patterns I see in the runners who come to my practice: using pain as the only traffic light. It hurts, I stop. It doesn’t hurt, I go back. And the cycle repeats for months, sometimes years.

In this article I explain why pain is a poor indicator for deciding when to return, what should be recovered before you run again, and how to make that return based on criteria rather than the calendar. It’s useful whether you’re a runner or you coach runners.

Pain goes away before the problem does

Pain tells you how sensitive an area is, not how ready it is to handle load. They are two different things that progress at different rates.

When you stop running, you remove the stimulus that was irritating the tissue and sensitivity drops. The pain disappears. But during those weeks of rest the tendon, bone or muscle hasn’t become any stronger. In many cases it has lost capacity, because rest also detrains.

Tendons are the clearest example. In a study of players with patellar tendinopathy, pain and function improved after four weeks of exercise, but ultrasound showed no structural changes in the tendon over that period. Something similar happens in Achilles tendinopathy: symptoms usually improve within 8 to 12 weeks of treatment, while the tendon keeps adapting for months.

Strength doesn’t come back on its own either. A systematic review with meta-analysis on Achilles tendinopathy found deficits in maximal, reactive and explosive strength compared with the healthy leg and with uninjured people. Reactive strength is exactly what you use when running, because every stride is a small single-leg hop.

This explains a finding that keeps coming up in research: having a previous injury is the main risk factor for getting injured while running. A review of prospective studies identified an injury in the previous 12 months as the most frequently cited risk factor, and a later review identified it as the strongest factor in long-distance runners. Many of those second injuries are really the first one that was never fully resolved.

What rest doesn’t fix

When a runner gets injured again in the same spot, there’s almost always something that rest hasn’t touched. These are the factors I see most often:

• Tissue capacity. The tendon or bone tolerates less load than before the injury, and going back to the previous volume overwhelms it again.

• Strength in the rest of the chain. Calf and soleus, quadriceps, gluteus medius. If they can’t absorb the impact, the load concentrates on the most vulnerable area.

• Movement pattern. A foot that doesn’t stabilize, an ankle with limited dorsiflexion or a hip that lets the knee collapse inward. Often, the area that hurts is the one paying for a problem elsewhere.

• Training load. The mistake that caused the injury (increasing volume, pace or elevation too quickly) is still there if it isn’t identified.

• Energy availability. Eating too little for how much you train compromises tissue recovery, and it weighs heavily on bone. In elite runners, amenorrhea in women and low testosterone in men, signs of sustained energy deficiency, were associated with 4.5 times higher rates of bone injuries.

If none of these factors has changed, going back to running means exposing the same tissue to the same load with the same preparation. The result is usually the same.

What should be recovered before you run again

There’s no single test that gives you the green light, and every injury has its own particularities. But expert consensus statements on return to sport agree on assessing several dimensions at once, not just pain. In practice, these are the ones I check before a runner goes back to running:

1. Pain under control in daily life. Walking briskly for 30 minutes, going up and down stairs and getting up in the morning without the area complaining, either during or the next day.

2. Comparable strength between sides. Single-leg heel raises, single-leg squats or single-leg glute bridges. As a common clinical reference, the goal is for the injured leg not to perform clearly below the healthy one, both in repetitions and in quality of execution.

3. Impact tolerance. Gentle two-leg hops, then single-leg hops and then continuous hops, without pain and without a reaction at 24 hours. If the area can’t tolerate 20 or 30 small hops in a row, it isn’t ready for thousands of strides yet.

4. Movement control. The knee doesn’t cave inward on landing, the pelvis stays stable and the foot doesn’t collapse when fatigue sets in.

5. Cause identified. Knowing what went wrong: load, movement pattern, strength, energy or a combination. Without this answer, the return is a gamble.

6. Confidence. Running with fear changes the way you run. Perceived confidence and psychological readiness are part of the return criteria proposed by expert consensus statements.

For bone injuries, the most recent review on returning to running after a tibial bone stress injury adds further requirements: tenderness on palpation of the bone has resolved, walking is pain-free, there is imaging evidence of healing in high-risk injuries, and the factors that contributed to the injury have been identified.

Return based on criteria, not the calendar

“Six weeks of rest and you’re back” is convenient, but it doesn’t take into account how each person responds. For anterior cruciate ligament injuries, the international consensus from the Panther Symposium was explicit: return decisions based solely on time should be abandoned. Return is understood as a continuum with three phases: return to participation, return to sport and return to performance.

Applied to running, a well-planned return has these characteristics:

• It starts with walk-jog intervals. For example, blocks of 1 to 2 minutes jogging and several minutes walking, on alternate days.

• It progresses volume first and intensity later. Paces, intervals and hills come once total running time is well tolerated.

• It changes one variable at a time. If you add minutes, don’t also increase pace or add elevation in the same week.

• It looks at the response at 24 hours. How you react the next morning tells you more than what you feel during the session.

Can you run with some discomfort?

It depends on the tissue. In tendinopathies, the pain-monitoring model by Silbernagel and colleagues allows you to keep running and jumping with moderate discomfort, below 5 out of 10, as long as it doesn’t increase the next day or get worse week after week. In their trial with Achilles tendinopathy patients, the group that kept running using this model had no worse outcomes than the group that rested from the activity.

Bone is a different story. With a bone stress injury, the standard is to progress only when symptom-free: during the run, afterwards and the next day. If pain appears, you stop and go back to the previous phase.

That’s why it’s so important to know what type of injury you have before deciding how much pain is acceptable.

Track it to decide better

To apply all of this, you need information. What you did, how much, at what intensity, how you felt during the session and how the area felt the next morning. Without that record, the decision to progress or hold back is made from memory, and memory tends to remember the workout that went well and forget the three niggles from the week before.

The review on returning to running after bone injury recommends that the decision be shared between the healthcare professional, the coach and the runner themselves. That only works if all three see the same data. This is how I work with my runners: the assessment sets the starting point, and daily tracking of load and of the response to each session in MyAlbatross tells us when to move forward, when to hold and when to step back.

The question you should be asking yourself

Before running again, swap the question “does it still hurt?” for these three: what has changed since I got injured?, is my body today more capable of handling the load than when it got injured? and do I know why it happened?

If the answer to all three is “nothing”, “no” and “I don’t know”, the pain has gone away, but the reason it appeared is still there.

This is the starting point of my book, No es donde te duele (“It’s not where it hurts”), published by DashBook. I wrote it for runners who want to understand why their aches appear and reappear, how to interpret the body’s signals and how to integrate load, strength, recovery and nutrition instead of looking only at the area that hurts. If this article has made you think about your last injury, you’ll find the complete process in the book.

References

• Saragiotto BT, et al. What are the main risk factors for running-related injuries? Sports Medicine, 2014. https://pubmed.ncbi.nlm.nih.gov/24809248/

• Van Poppel D, et al. Risk factors for overuse injuries in short- and long-distance running: a systematic review. Journal of Sport and Health Science, 2021. https://doaj.org/article/658f5d3798fe41a2b1d0978f80c2a4a0

• Altered strength profile in Achilles tendinopathy: a systematic review and meta-analysis. https://pmc.ncbi.nlm.nih.gov/articles/PMC6761911

• Silbernagel KG, Thomeé R, Eriksson BI, Karlsson J. Continued sports activity, using a pain-monitoring model, during rehabilitation in patients with Achilles tendinopathy: a randomized controlled study. American Journal of Sports Medicine, 2007. https://search.pedro.org.au/search-results/record-detail/18389

• George, Sheerin and Reid. Criteria and guidelines for returning to running following a tibial bone stress injury: a scoping review. Sports Medicine, 2024. https://link.springer.com/article/10.1007/s40279-024-02051-y

• Panther Symposium ACL Injury Return to Sport Consensus Group. Return to sport after anterior cruciate ligament injury, 2020. https://www.healthpartners.com/knowledgeexchange/display/document-rn22245

• Establishing return to play criteria after acute lateral ankle sprain injuries: an international Delphi study. https://researchportal.be/en/node/5581461