“Niggles” predict bigger injuries
Minor unresolved physical complaints — what runners often call 'niggles' — substantially elevate the risk of progressing to a full injury that interrupts training.
In plain English
A niggle is a small ache that lingers between runs but does not stop you yet. These often come right before the injuries that do stop you. In one study, carrying a niggle raised injury risk roughly 4 to 7 times.
Why it works
Niggles likely represent early-stage tissue stress that the runner hasn't yet remediated. Ignoring or running through them allows the underlying load mismatch to continue.
What it means in practice
Treat persistent low-grade pain as a meaningful signal, not just background noise. In Buena Vida-style logging, encourage runners to flag 'niggles' separately from acute pain and adjust training in response. When a runner reports a niggle, the recommendation is generally to back off intensity or volume for a week — not stop entirely, but clearly reduce.
The evidence
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Non-time-loss injuries ('niggles') strongly predict subsequent time-loss injuries. Risk of TL injury was 3.6 times higher when preceded by 'minor' non-TL complaint and 6.9 times higher when preceded by 'moderate' non-TL complaint within the previous 7 days. Predictive power was good (AUC 0.73-0.83; predictive accuracy 22.0-41.8%). Over a quarter of players reported a physical complaint each week that did not prevent training/match play (28% of compliant questionnaires). The minor complaints carry meaningful injury-warning information that current training systems often ignore.
n=218
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Recreational runners describe injury along a 9-level continuum, from injury-free to career-ending injury. Each level is described across four categories of descriptors: physical description, outcome (effect on running and daily life), psychological description, and management. Lower levels of injury (early signaling, niggles, mild discomfort) are routinely trained through. Runners only self-classify as 'injured' when they need a healthcare-professional consultation or have to cease running. The Running Injury Continuum is proposed as a tool for both injury surveillance (researchers, healthcare professionals) and risk-factor research, and as a framework for educating runners about appropriate self-management of lower-level injuries.
n=31
Why we call confidence medium
Whalan 2019 in football showed niggles raised subsequent injury risk 3.6-6.9x. Lacey 2023 Running Injury Continuum confirms qualitatively in runners that lower-level symptoms precede time-loss injuries. Direct prospective running data is more limited.
Where it applies
Adult recreational and trained runners.
Does not apply to: normal post-workout muscle soreness that resolves within 48-72 hours.
Plans that respect this
Plans that scored well on the rubric measures informed by this claim.
- 10-Week Run Your First 10k (3 days)
- 10-Week Run Your First 10k (4 days)
- 10-Week Run Your First Half Marathon (3 days)
- 10-Week Run Your First Half Marathon (4 days)
- 10-Week Sub-1:30 Half Marathon (4 days)
- 10-Week Sub-1:30 Half Marathon (5 days)
- 10-Week Sub-1:30 Half Marathon (6 days)
- 10-Week Sub-1:45 Half Marathon (4 days)
- 10-Week Sub-1:45 Half Marathon (5 days)
- 10-Week Sub-1:45 Half Marathon (6 days)
- 10-Week Sub-2 Half Marathon (3 days)
- 10-Week Sub-2 Half Marathon (4 days)
Last reviewed 2026-05-01. See how we score.