Why Do Runners Get Injured?
Running is one of the simplest and most natural forms of exercise, yet injuries are remarkably common. Studies suggest that between forty and fifty percent of runners experience at least one injury per year. That is a staggering number, and it raises an obvious question: if running is so natural, why does it hurt so many people?
The answer, in most cases, is not that running is inherently dangerous. It is that runners make predictable mistakes that increase their injury risk. Running too much, too soon. Ignoring warning signs. Skipping recovery. Wearing worn-out shoes. Neglecting strength work. These are all preventable factors, and addressing them can dramatically reduce your chances of getting sidelined.
This guide covers the most common running injuries, their causes, and practical strategies to prevent them. Whether you are a beginner or an experienced runner, these principles apply to everyone.
The Number One Rule: Do Not Increase Too Quickly
The single biggest cause of running injuries is doing too much, too soon. Your cardiovascular fitness improves faster than your muscles, tendons, and bones can adapt. You feel fit enough to run further or faster, but your body is not structurally ready for the increased load. The result is overuse injuries: the gradual breakdown of tissues that cannot keep up with the demands being placed on them.
The widely cited ten percent rule suggests that you should not increase your weekly running volume by more than ten percent from one week to the next. While this is a useful guideline, it is not a rigid law. Some runners can handle faster progression, while others need to be more conservative. The key principle is gradual, progressive overload. Give your body time to adapt to each new level of stress before adding more.
For run club members, this means being honest about your current fitness level and not trying to keep up with faster or more experienced runners before you are ready. A good run club will offer pace groups and session options that allow you to progress at your own rate. If yours does not, speak to the leader about it.
The Most Common Running Injuries
Shin Splints
Shin splints cause pain along the front or inside edge of the shin bone. They are one of the most common injuries among new runners and typically occur when you increase your running volume or intensity too quickly.
Prevention: Increase your mileage gradually. Run on softer surfaces when possible, as concrete and tarmac transmit more impact than grass or trails. Strengthen your calves and the muscles around your shins with exercises like calf raises and toe raises. Make sure your running shoes provide adequate cushioning and support.
Warning signs: A dull ache in the shins during or after running. If the pain is sharp, localised to one spot, or persists when you are not running, see a physiotherapist to rule out a stress fracture.
Runner's Knee
Runner's knee, or patellofemoral pain syndrome, causes pain around or behind the kneecap. It is often worse when running downhill, climbing stairs, or sitting for long periods with bent knees.
Prevention: Strengthen your quadriceps, glutes, and hip muscles. Weakness in these areas causes the kneecap to track incorrectly, creating friction and pain. Squats, lunges, and single-leg exercises are all effective. Avoid sudden increases in hill running, which places extra stress on the knee joint.
Warning signs: A grinding or clicking sensation behind the kneecap. Pain that worsens with activity and improves with rest. Swelling around the knee.
Plantar Fasciitis
Plantar fasciitis causes pain in the heel or arch of the foot, typically worst with the first steps in the morning or after sitting for a long time. It is caused by inflammation of the plantar fascia, a thick band of tissue that runs along the bottom of the foot.
Prevention: Stretch your calves and the soles of your feet regularly. Rolling a tennis ball or frozen water bottle under your foot can help keep the fascia supple. Wear supportive shoes, both for running and for daily life. Walking barefoot on hard floors can aggravate the condition.
Warning signs: Sharp pain in the heel when you first stand up in the morning. Pain that eases as you warm up but returns after long periods of standing or walking.
Achilles Tendinitis
Achilles tendinitis causes pain and stiffness in the Achilles tendon, which connects the calf muscles to the heel bone. It is common in runners who increase their speed work or hill running too quickly.
Prevention: Strengthen your calves with eccentric heel drops, which are one of the most evidence-based exercises for Achilles tendon health. Warm up thoroughly before speed sessions. Avoid running in shoes with a very low heel-to-toe drop if you are not accustomed to them, as this places extra strain on the Achilles.
Warning signs: Stiffness in the Achilles first thing in the morning. Pain at the back of the ankle during or after running. A noticeable thickening of the tendon.
IT Band Syndrome
IT band syndrome causes pain on the outside of the knee, typically during or after running. The iliotibial band is a thick strip of connective tissue that runs from the hip to the knee, and when it becomes tight or inflamed, it creates friction at the knee joint.
Prevention: Strengthen your glutes and hip abductors. Weakness in these muscles causes the IT band to work harder than it should. Foam rolling the outer thigh can help reduce tightness, although it does not address the underlying weakness. Avoid running on cambered roads, which place uneven stress on the legs.
Warning signs: A sharp or burning pain on the outside of the knee that starts during a run and worsens as you continue. The pain typically disappears when you stop running but returns when you start again.
The Role of Strength Training
If there is one thing you can do to reduce your injury risk, it is strength training. Runners who incorporate regular strength work into their routine are significantly less likely to get injured than those who only run.
You do not need a gym membership or heavy weights. Bodyweight exercises performed two to three times per week are enough to make a meaningful difference. Focus on the key muscle groups that support running:
- Glutes: Squats, lunges, bridges, single-leg deadlifts
- Core: Planks, dead bugs, bird dogs, side planks
- Calves: Calf raises, eccentric heel drops
- Hips: Clamshells, lateral band walks, hip hikes
Each session takes fifteen to twenty minutes. That is a tiny investment of time for a significant reduction in injury risk. Some run clubs incorporate strength exercises into their warm-up or cool-down, which is an excellent way to make it a habit.
Recovery: The Missing Piece
Recovery is not laziness. It is an essential part of the training process. Your body does not get stronger during a run. It gets stronger during the recovery period afterwards, when damaged tissues are repaired and rebuilt.
Sleep. Aim for seven to nine hours per night. Sleep is when the majority of tissue repair and hormonal recovery occurs. Chronic sleep deprivation increases injury risk and impairs performance.
Rest days. Take at least one or two complete rest days per week. Active recovery, like walking, swimming, or gentle yoga, is fine on these days. The goal is to give your running muscles a break while staying mobile.
Nutrition. Eat enough to support your training. Under-fuelling, whether intentional or accidental, weakens bones, impairs recovery, and increases injury risk. Make sure you are getting enough protein, calcium, and vitamin D.
Listen to your body. This is the most important recovery strategy of all. If something hurts, pay attention. A niggle that you ignore today can become an injury that sidelines you for weeks. The difference between a minor issue and a major one is often just a few days of rest.
When to See a Professional
Not every ache and pain requires a trip to the physiotherapist. Mild muscle soreness after a hard session is normal and usually resolves within a day or two. But certain signs warrant professional attention:
- Pain that persists for more than a week despite rest
- Pain that worsens with each run rather than improving
- Sharp, localised pain in a bone, which could indicate a stress fracture
- Swelling, bruising, or inability to bear weight
- Pain that affects your gait or causes you to limp
A good sports physiotherapist will diagnose the issue, identify the underlying cause, and give you a plan to get back to running safely. Many run clubs have relationships with local physio clinics and can recommend someone who understands runners.
Prevention Is a Team Effort
One of the advantages of being in a run club is that you are surrounded by people who understand the challenges of running. If you are dealing with a niggle, chances are someone in your group has been through the same thing and can share their experience.
Run club leaders can also play a role in injury prevention by structuring sessions that include warm-ups, cool-downs, and strength exercises. By building these elements into the club routine, leaders help their members stay healthy and running for longer.
The RunClub app helps you track your attendance and running consistency, making it easier to spot patterns that might indicate overtraining. If you notice that you have been running every day for three weeks without a rest day, that is a signal to ease off before your body forces you to.
Stay healthy, stay consistent, and stay running. Download RunClub to find a club that supports your running journey from your first kilometre to your thousandth.
