Running Injuries: Why They Happen and How to Return Safely
Running is one of the most effective things you can do for long-term health, and one of the easiest activities to get injured doing. Most people who run regularly will pick up something at some point, and the majority of what comes through clinic is not the result of one dramatic moment. It builds quietly over weeks, usually because the training load moved faster than the body's ability to adapt to it.
That distinction matters, because it changes what the fix looks like.
Most running injuries are a load problem, not a damage problem
Tissue in the body responds to load by adapting to it. Bone, tendon and muscle all get stronger when they are stressed and then given time to recover. Problems tend to appear when the stress outpaces the recovery: a sudden jump in weekly mileage, a new block of hill or speed work, a switch in surface or footwear, a race entered on short notice, or simply a run of poor sleep and high life stress alongside a normal training week.
This is why an injury often appears in a leg that was, until recently, coping perfectly well. Very often nothing is structurally wrong with it. The load applied to it changed faster than it could adapt.
The injuries seen most often in runners
Several conditions account for a large share of running-related presentations:
Pain at the front of the knee, around or behind the kneecap, is one of the most common of all.
Pain along the shin during or after running, sometimes described as shin splints.
Achilles and other tendon pain, typically stiff and sore at the start of activity.
Hip and groin pain, which is frequently under-reported by runners until it starts affecting stride.
Foot and ankle pain, including pain under the heel first thing in the morning.
Most of these respond well to a combination of load management, targeted strengthening and a graded return, rather than complete rest.
The one category not to run through
Bone stress injuries are the exception. These sit on a spectrum from a stress reaction through to a stress fracture, and continuing to run on one can turn a problem measured in weeks into a problem measured in months.
Features that should prompt assessment rather than a wait-and-see approach:
Pain in one specific, small area of bone that you can point to with a finger
Pain that worsens as a run goes on, rather than easing once warmed up
Pain when hopping on the affected leg
Pain at rest or at night
A recent significant increase in training load, particularly alongside low energy availability, disordered eating patterns, or missed or absent periods
That last point matters. Repeated bone stress injuries are sometimes the first visible sign of a wider problem with energy availability rather than an isolated training error.
When to rest, and when to keep moving
Complete rest is rarely the answer for load-related running pain, and it often makes the return harder, because the tissue deconditions while you wait.
A more useful approach for most non-bone injuries is to keep the pain within acceptable limits rather than eliminating it entirely: pain that stays mild during the run, settles within roughly 24 hours, and is not worse the following morning generally indicates the load is tolerable. Pain that climbs through a run, lingers into the next day, or steadily worsens week on week indicates it is not.
Bone stress injuries are the clear exception and need proper assessment.
Rebuilding running load
A few principles hold up well across most returns:
Progress gradually, but not by a formula. The often-quoted rule about increasing weekly mileage by no more than ten per cent is widely repeated but not well supported by evidence. Progression should be guided by how the tissue responds, not by an arbitrary percentage.
Change one thing at a time. Volume, intensity, frequency, surface and footwear are separate variables. Moving several at once makes it impossible to identify what caused a flare.
Use a walk-run structure early. It allows a return to running long before continuous running is comfortable.
Keep strength work in the plan. Strength training is one of the better supported interventions for reducing running injury risk, and it does not stop being useful once the pain has settled.
Protect recovery. Sleep and adequate fuelling are part of the training plan, not separate from it.
When to seek assessment
It is worth getting properly assessed if pain has persisted beyond two to three weeks despite sensible load reduction, if it is localised to a specific point of bone, if it is affecting your walking or your gait, if there is significant swelling, giving way or locking, or if the same injury keeps returning each time you build back up. Recurrence is usually information: something in the diagnosis or the return plan has been missed.
A consultation typically involves a detailed history of your training and symptoms, a musculoskeletal examination, a review of any relevant imaging, and a management plan built around your actual running goals.
This information is educational and does not replace an individual medical assessment.