Why Your Ankle Hurts When You Run
A systematic review of running-related musculoskeletal injuries found that the knee, ankle, and lower leg are the three most frequently injured sites in runners, with ankle injuries accounting for approximately 5-10% of all running injuries. Ankle pain in runners typically falls into one of four categories: tendonitis (inflammation of the tendons around the ankle, especially the peroneal tendons on the outside or the posterior tibial tendon on the inside), ankle sprains (ligament damage from rolling the ankle on uneven ground), stress reactions or fractures (bone overload from excessive training), or impingement (compression of soft tissue at the front or back of the ankle). Most ankle pain in runners is an overuse injury caused by training load errors, weak ankle stabilisers, or biomechanical factors. It is treatable and preventable.
The Most Common Types of Ankle Pain in Runners
Outer (lateral) ankle pain. The most common cause is peroneal tendonitis, inflammation of the peroneal tendons that run behind the outer ankle bone. These tendons stabilise your foot during the push-off phase of running and are stressed by running on cambered roads, excessive supination (rolling outward), and sudden increases in mileage. Symptoms include pain behind or below the outer ankle bone that worsens during running and may feel stiff in the morning. Lateral ankle sprains, where the foot rolls inward and stretches the outer ligaments, are also common on trails and uneven terrain.
Inner (medial) ankle pain. Posterior tibial tendonitis is the primary cause. The posterior tibial tendon supports your arch and controls pronation. When it becomes overloaded, it causes pain behind and below the inner ankle bone. This condition is more common in runners with flat feet or excessive pronation, who place greater stress on this tendon with every stride. Inner ankle pain that worsens during longer runs and feels better with rest is a hallmark sign.
Front ankle pain. Anterior ankle impingement causes pain at the front of the ankle, particularly during dorsiflexion (pulling your toes toward your shin). This is common in runners with limited ankle mobility and is worsened by uphill running, where dorsiflexion demand is highest. Bone spurs or thickened soft tissue at the front of the joint can contribute.
Achilles area pain. While often categorised separately, pain where the Achilles tendon inserts into the heel bone is technically ankle pain. Insertional Achilles tendonitis causes pain at the back of the ankle, particularly when pushing off. It is covered in detail in our Achilles tendon pain guide.
Stress fractures. The most serious cause of ankle pain in runners. Stress fractures in the ankle area (talus, navicular, or medial malleolus) cause deep, localised pain that worsens with impact and does not improve with rest over several days. If you have point tenderness over a bone, pain that is present with walking, or pain that wakes you at night, see a healthcare professional promptly.
How to Prevent and Treat Ankle Pain
- Strengthen your ankle stabilisers. Weak ankle muscles are the most modifiable risk factor for ankle pain. Exercises: single-leg balance holds (30-60 seconds each side), resistance band eversion and inversion (3 sets of 15), single-leg calf raises (3 sets of 15), and ankle circles in all directions. Perform these 3 times per week. Strong ankle stabilisers absorb impact better and protect tendons and ligaments from overload.
- Progress training load carefully. Follow the 10% rule for weekly mileage increases. Avoid adding hill work, trail running, and speed sessions simultaneously. Each of these stresses the ankle in different ways, and adding multiple new stressors at once exceeds the ankle's adaptation capacity. When transitioning to trail running, start with short, flat trails before adding technical terrain.
- Choose appropriate footwear. Shoes that are worn out (over 500-800 km) lose lateral stability and ankle support. For runners with recurrent outer ankle pain, shoes with a wider base and good lateral support reduce the ankle's stabilisation burden. For inner ankle pain associated with overpronation, stability shoes or motion control shoes may help. Replace shoes before they lose their structural integrity.
- Support pronation control under load. If your ankle pain correlates with pronation, a structured insole can help control the degree of inward roll during the loading phase. The Shapes HYROX Edition insole supports the medial arch and helps distribute ground reaction forces more evenly across the foot, reducing the strain on the posterior tibial tendon. This is most relevant for runners whose inner ankle pain worsens during longer efforts when foot muscles fatigue and pronation increases.
- Be conscious of running surfaces. Cambered roads (with a slope from centre to gutter) create asymmetric ankle loading. The downhill foot overpronates while the uphill foot supinates. If you run on roads, alternate which side of the road you run on, or favour flat paths. For trail runners, ankle strengthening and proprioception work (balance exercises on unstable surfaces) are essential to reduce sprain risk on technical terrain.
- Identify biomechanical contributors. Recurring ankle pain often has a biomechanical component: excessive pronation, limited ankle mobility, or asymmetric ground contact. An Arion Running Analysis session quantifies foot strike pattern, pronation behaviour, and contact time asymmetry, giving you specific data on what your ankle is doing under running load. This turns guesswork into targeted correction.
FAQ
Why does my ankle hurt when I run?
The most common causes are tendonitis (peroneal on the outside, posterior tibial on the inside), ankle sprains from uneven surfaces, weak ankle stabilisers, and training load errors (increasing mileage or adding hills too quickly). Less common but more serious causes include stress fractures. The location of the pain (inner, outer, front, or back) helps identify the specific structure involved. If the pain started after a sudden increase in training, load management is usually the first step.
Should I run with ankle pain?
Mild, diffuse ankle pain that does not worsen during running and does not alter your stride is generally safe to run through at easy pace with reduced volume. However, sharp or localised pain, pain that increases during running, pain that causes a limp, or pain over a bone should not be run through. Running with altered form to avoid pain creates compensation patterns that can injure other structures. When in doubt, reduce and modify rather than push through.
How do I strengthen my ankles for running?
Four key exercises, 3 times per week: single-leg balance holds (30-60 seconds per side, progress to eyes closed and unstable surfaces), resistance band eversion and inversion (3 sets of 15 per direction), single-leg calf raises (3 sets of 15 per leg), and ankle alphabet (tracing the alphabet with your toe to move the ankle through its full range). These build the strength, endurance, and proprioception that protect the ankle during running.
What is the difference between inner and outer ankle pain?
Outer (lateral) ankle pain in runners is most commonly caused by peroneal tendonitis or lateral ankle sprains. It is associated with supination (rolling outward) and running on uneven or cambered surfaces. Inner (medial) ankle pain is most commonly caused by posterior tibial tendonitis and is associated with overpronation (rolling inward) and flat feet. The distinction matters because the treatment differs: outer ankle pain benefits from stability and proprioception work, while inner ankle pain often benefits from pronation control and arch support.
How long does ankle tendonitis take to heal?
Mild tendonitis (pain only during running, no swelling): 2-4 weeks with load modification and strengthening exercises. Moderate tendonitis (pain during and after running, mild swelling): 4-8 weeks with structured rehabilitation. Severe or chronic tendonitis (pain with daily activities, persistent swelling): 8-12+ weeks, potentially requiring professional treatment. The most common mistake is returning to full training too quickly. Tendon healing requires progressive loading, meaning gradually increasing the demand on the tendon over time, not just resting until the pain stops.
