Why Runners Get Injured (and How to Prevent It)
Most running injuries aren't caused by bad luck, bad shoes, or bad biomechanics. They're caused by training errors, usually some version of doing too much, too soon, without enough recovery in between (Nielsen et al., 2012). Somewhere between one third and just over half of regular runners deal with an injury in any given year (Kakouris et al., 2021), and the good news is that a large share of that risk is modifiable.
What Are the Most Common Running Injuries?
Running injuries tend to cluster around a fairly predictable list. Runner's knee, medically known as patellofemoral pain syndrome, is one of the most frequently reported. Shin splints, Achilles tendinopathy, plantar fasciitis, and IT band syndrome round out the usual suspects. Stress fractures are less common but more serious, and they tend to show up in runners who've ramped up volume or intensity aggressively.
What almost all of these have in common is that they're overuse injuries. They don't happen from a single bad step, the way a rolled ankle or a torn hamstring might. They build gradually, from repeated load that outpaces the tissue's ability to repair and adapt.
Are Running Injuries Really Just Bad Luck?
Not really, and this is worth sitting with. It's tempting to treat injury as something that happens to you, like catching a cold. But the evidence points somewhere different. Systematic reviews of running injury research consistently identify training errors, sudden spikes in distance, pace, or frequency, as one of the strongest and most modifiable contributors to injury risk (Nielsen et al., 2012).
That reframe matters because it changes what you can actually do about it. You can't control genetics or the fact that you have a desk job that keeps your hips tight all day. You can control how quickly you ramp up your weekly kilometres.
How Common Are Running Injuries, Really?
The numbers vary depending on the population studied and how "injury" gets defined, but a broad synthesis of the research puts running-related injury rates somewhere in the range of a third to more than half of runners affected over a 12 month period, with lower limb injuries dominating the picture (Kakouris et al., 2021). Novice runners and those returning after a break tend to sit at the higher end of that range, which lines up neatly with the training error explanation. New runners are the group most likely to increase load too quickly, simply because they don't yet have a feel for what "too much" looks like.
What Actually Causes Most Running Injuries?
The research points to a small handful of factors that show up again and again.
Sudden increases in training load. This is the headline finding across the literature. Whether it's distance, pace, frequency, or hill work, a sharp jump from what your body is used to is consistently linked with higher injury rates (Nielsen et al., 2012).
Previous injury. A prior injury, especially one that wasn't fully rehabilitated, is one of the clearest predictors of a repeat injury. Tissue that's been injured once often stays more vulnerable until it's properly strengthened again.
Inadequate recovery. Running again before the previous session's fatigue has cleared compounds load in a way that doesn't show up on a training log but shows up in your joints.
Rapid changes in surface, footwear, or terrain. Switching abruptly from road to trail, or into minimalist shoes, changes the load pattern on your body faster than it can adapt.
Notice what's missing from that list: things like foot strike pattern or shoe brand, which get a disproportionate amount of attention online. They matter less than training load management does.
Does Strength Training Prevent Running Injuries?
There's a reasonably strong case for it. Running is a repetitive, single-leg impact activity, and stronger muscles, tendons, and connective tissue handle that repeated load better than weaker ones do. Two sessions a week of basic strength work, things like squats, lunges, calf raises, and single-leg balance work, target exactly the areas that take the brunt of running's impact: hips, glutes, calves, and feet.
You don't need a complicated program. Twenty to thirty minutes, twice a week, focused on the lower body and core, is enough to make a meaningful difference for most recreational runners. It's one of the highest-leverage things you can add to a running routine that doesn't involve running at all.
How Much Do Sleep and Recovery Matter?
More than most runners give them credit for. Tissue repair, the actual physiological process that turns training stress into strength, happens largely during sleep and rest, not during the run itself. Consistently short sleep is associated with higher injury and illness rates across endurance sports generally, likely because it blunts the body's capacity to recover between sessions.
Practically, this means a hard week of training paired with poor sleep is a much higher risk combination than the same training week with solid sleep. If you know a stretch of bad sleep is coming, whether that's work stress or a new baby, it's often smarter to hold your training load steady rather than pushing forward as planned.
How Should You Progress Your Training to Stay Injury Free?
The single most protective habit a runner can build is patience with progression. That means increasing weekly volume gradually, building in regular step-back weeks where load drops rather than climbs, and treating niggles as information rather than something to push through.
A useful mental model: your cardiovascular fitness improves faster than your bones, tendons, and ligaments do. You might feel ready for more running well before your Achilles tendon is. Bridging that gap with patience, rather than assuming how you feel is the whole story, is what separates runners who train consistently for years from those who cycle through injury, rest, and frustration.
Frequently Asked Questions
What is the single biggest risk factor for running injury? Sudden increases in training load, whether that's distance, pace, or frequency, are the most consistently identified risk factor across the research (Nielsen et al., 2012).
Are running injuries mostly from bad running form? Form plays a role, but it's a smaller factor than training load management in most of the evidence. Focusing on sensible progression tends to prevent more injuries than focusing on stride mechanics alone.
How many runners get injured each year? Estimates vary, but reviews of the literature suggest somewhere between roughly a third and over half of regular runners experience an injury in any given year, with new and returning runners at higher risk (Kakouris et al., 2021).
Does strength training actually reduce injury risk? It's one of the more evidence-supported additions a runner can make. Stronger hips, glutes, and calves handle repetitive impact better, which is why two short strength sessions a week are widely recommended alongside running itself.
References
- Nielsen, R. O., Buist, I., Sørensen, H., Lind, M., & Rasmussen, S. (2012). Training errors and running related injuries: a systematic review. International Journal of Sports Physical Therapy, 7(1), 58-75.
- Kakouris, N., Yener, N., & Fong, D. T. P. (2021). A systematic review of running-related musculoskeletal injuries in runners. Journal of Sport and Health Science, 10(5), 513-522.
Olly. Sunday Salt.
