London Marathon 2026: The Training Injuries You Shouldn't Ignore — Expert Sports Medicine Advice

With 578,374 people entering the ballot for just 55,000 places, the TCS London Marathon on April 26, 2026 is already one of the most anticipated running events of the year. But for the thousands of amateur runners now deep into their training programmes, a less welcome statistic looms: up to 90% of marathon trainees suffer a training injury before race day.

The injury numbers behind Britain's most popular race

The London Marathon attracts runners of every level — from elite athletes chasing sub-2:30 finishes to first-timers completing their bucket list. What unites them is the physical demand of building up to 26.2 miles, and the risk that comes with it.

According to research published in the British Journal of Sports Medicine, injury incidence rates in marathon runners range from 40% to 90% over a training cycle, with most injuries occurring in the final six weeks of preparation. For the London Marathon, that window falls squarely in March and April 2026 — right now.

The most common culprits are all overuse injuries:

• Runner's knee (patellofemoral pain syndrome) — the most frequent complaint, causing pain under or around the kneecap
• IT band syndrome — tightness along the outer thigh that can make running feel like knee surgery
• Shin splints — aching pain along the shin bone, often signalling bone stress
• Achilles tendinopathy — stiffness and pain at the back of the heel, especially on morning steps
• Plantar fasciitis — a sharp stabbing sensation under the foot arch, worst after rest

None of these conditions are rare. Most amateur runners will experience at least one during a 16- to 20-week marathon training plan.

The difference between normal soreness and an injury that won't wait

Every runner knows the ache of heavy legs two days after a long run. Delayed onset muscle soreness (DOMS) is a sign of adaptation — your body getting stronger. The problem is that many runners confuse muscle soreness with injury, and keep training through conditions that need rest and assessment.

Here are the red flags that distinguish soreness from injury:

Seek medical attention if you notice:

• Pain that gets worse during a run, rather than easing off after a warm-up kilometre
• Pain that persists beyond 72 hours of rest without improvement
• Visible swelling around a joint or along a tendon
• Pain that causes you to alter your gait — limping, favouring one side, shortening your stride
• Any sharp or stabbing pain in the foot, heel, or knee that appears suddenly

The 10% rule — never increasing your weekly mileage by more than 10% — is well-established in sports medicine. But it is not a guarantee. Runners following structured plans can still develop stress fractures, particularly if they have nutritional deficiencies (low vitamin D is common in the UK in spring) or biomechanical issues like overpronation.

Why this year's training window is particularly risky

March 2026 has brought colder, wetter conditions across Britain, which creates two specific risks for marathon trainees. First, running on wet pavement and uneven verges increases the likelihood of ankle sprains and falls. Second, cold muscles that have not warmed up adequately are more susceptible to sudden tendon and muscle strains.

For runners training in the dark after work, the combination of tiredness, poor visibility, and cold temperatures is particularly dangerous. A sports medicine specialist can review your training load, identify biomechanical imbalances before they become injuries, and — if you are already injured — map a return-to-running plan that gets you to the start line without making things worse.

Research from the University of Calgary, published in the British Journal of Sports Medicine, found that adding two strength training sessions per week reduced running-related injury rates by approximately 30%. Exercises targeting the glutes, hip abductors, and calf complex are particularly effective for the injuries that plague marathon runners.

What a sports medicine consultation actually looks like

Many runners assume they need to see a GP first and wait for a referral. In practice, sports medicine specialists and physiotherapists can be seen directly, and for running injuries, they offer a far more relevant assessment than a general practice appointment.

A typical sports medicine consultation for a marathon runner will include:

1. A load review — how many kilometres per week, how quickly the volume has built, rest day frequency
2. A gait analysis — often done on a treadmill, identifying overpronation, heel-striking, or hip drop
3. A tissue assessment — palpation to identify the specific structure that is inflamed or irritated
4. A return-to-running plan — whether that means two weeks off, a modified programme, or simply adjusted footwear

According to NHS Sport and Exercise Medicine guidance, early intervention almost always produces better outcomes than running through pain and presenting later with a more complex injury.

For London Marathon 2026 runners, the race is on April 26. There are still five weeks of training time — and five weeks is exactly the window in which a sports medicine assessment can make the difference between a DNS (did not start) and a finish line photo.

Protecting your investment in race day

Entry places for the London Marathon cost up to £53 for UK residents. Charity runners have typically raised thousands of pounds in sponsorship. The financial — and emotional — cost of a preventable injury in the final month is significant.

The most practical steps you can take this week:

• Replace your running shoes if they have more than 400 miles on them — worn shoes are a leading cause of knee and foot injuries
• Add a strength session targeting single-leg squats, calf raises, and glute bridges — 20 minutes twice a week is enough
• Book a sports medicine consultation if you have any nagging pain that has lasted more than a week — an Expert Zoom sports doctor can assess you quickly and help you make the right call

Medical disclaimer: This article provides general information only. If you are experiencing pain that limits your ability to run or carry out daily activities, please consult a qualified medical professional. Do not use this article as a substitute for personalised medical advice.

Your marathon training has taken months. Do not let the final stretch undo it. Connect with a sports medicine doctor on Expert Zoom to get the guidance you need before April 26.