Ankle pain after running rarely has a single cause. It’s usually the result of a combination of factors: the surfaces you train on, the shoes you wear, your current fitness level, and how well your body has been prepared for the demands of running. Some of the most frequent general causes include:
- Uneven or unstable surfaces, such as trails, cobblestones, or cambered roads, which increase the risk of the ankle rolling or twisting.
- A sudden jump in training volume or intensity, which doesn’t give your tendons and bones enough time to adapt.
- Worn-out or unsuitable running shoes that fail to support or cushion the foot properly.
- Muscle imbalances or weak stabilizing muscles around the ankle and hip, which can also contribute to issues elsewhere in the kinetic chain, such as hip pain after running.
- Returning to running too quickly after a break, illness, or previous injury.
Beyond these general factors, most cases of ankle injuries fall into one of four specific categories — and each one has its own causes, symptoms, and treatment approach.
Tendinitis
Tendinitis is the inflammation of a tendon, usually caused by repetitive overuse rather than a single traumatic event. In runners, the two most common forms affecting the ankle are extensor tendinitis and peroneal tendinitis.
Extensor Tendinitis
Causes: Extensor tendinitis affects the tendons running across the top of the foot and ankle. It typically develops from repetitive motion, tight or poorly laced running shoes that press on the top of the foot, or a sudden increase in training load.
Symptoms: Pain and tenderness along the top of the foot or front of the ankle, which tends to worsen with activity, along with swelling, stiffness, and sometimes visible discoloration around the tendon.
Treatment: Rest, ice, compression, and elevation (the RICE method) are the first line of treatment, alongside anti-inflammatory medication if needed and adjustments to footwear or lacing. According to Cleveland Clinic, most people recover fully within a few weeks to a few months, depending on how early the irritation is addressed.
Peroneal Tendinitis
Causes: This affects the peroneal tendons on the outer side of the ankle and is usually linked to repetitive overuse, a sudden spike in mileage, or a previous ankle sprain that was not fully rehabilitated.
Symptoms: Pain along the outer ankle that intensifies during activity, swelling, warmth, and sometimes a thickened, nodular feeling along the tendon.
Treatment: Conservative treatment — RICE, temporary immobilization or bracing, anti-inflammatories, and physical therapy — resolves most cases within three to four weeks. Surgery is rarely needed and reserved for cases that don’t respond to conservative care.
Sprains
Causes: An ankle sprain happens when you roll, twist, or turn the ankle in an awkward way, stretching or tearing one or more ligaments. According to Mayo Clinic, this most often happens when running on uneven surfaces, landing awkwardly after a stride, or making a sudden change of direction.
Symptoms: Pain, tenderness to the touch, swelling, bruising, reduced range of motion, a feeling of instability, and sometimes a popping sound or sensation at the moment of injury.
Treatment: Most sprains respond well to the RICE method, with recovery times ranging from one to three weeks for mild sprains to two to three months for more severe ones. Following current evidence-based guidance, functional treatment — short-term protection followed by early, guided movement and rehabilitation exercises — tends to produce better long-term outcomes than prolonged immobilization.
Strains
Causes: Unlike sprains, which affect ligaments, an ankle strain involves the muscles or tendons around the joint. An ankle strain from running typically results from overstretching during a sudden movement, running while fatigued, or insufficient warm-up before a session.
Symptoms: Localized pain and tightness, muscle spasm, swelling, and difficulty moving the ankle through its normal range of motion.
Treatment: Rest and the RICE method remain the foundation of treatment, along with a gradual, progressive return to activity to avoid re-injury. Gentle stretching and mobility work, once the acute pain has settled, help restore normal function.
Stress Fractures
Causes: An ankle stress fracture is a tiny crack in the bone caused by repetitive impact rather than a single traumatic event. According to Cleveland Clinic, common triggers include training too frequently without adequate rest, ramping up mileage or intensity too quickly, switching abruptly between surfaces (for example, from a treadmill to road running), and running in worn-out shoes.
Symptoms: Pain that starts during activity and gradually worsens, localized tenderness and swelling, and — unlike most muscular soreness — discomfort that persists even after the activity has stopped.
Treatment: Stress fractures require a longer recovery than sprains or tendinitis, typically six to eight weeks of rest, activity modification, and sometimes immobilization in a boot. Ignoring the early warning signs and continuing to run through the pain is the most common way a stress fracture worsens, so early diagnosis matters.
Sprained Ankle vs. Broken Ankle: What’s the Difference?
It isn’t always obvious whether you’re dealing with a sprained ankle or a broken one, since both can cause pain, swelling, and difficulty walking. As a general rule, a sprain tends to cause pain concentrated around the ligaments (usually the outer ankle), while a fracture often produces pain directly over the bone, along with a greater inability to bear any weight at all. That said, this distinction isn’t reliable enough to self-diagnose. If you have significant swelling, can’t take more than a step or two without severe pain, or hear or feel a snap at the moment of injury, it’s best to get an X-ray. Clinically, the Ottawa Ankle Rules — a diagnostic tool used in emergency medicine — are over 99% sensitive at identifying when an X-ray is genuinely needed, which shows just how much overlap there can be between the two injuries on the surface.
Other Contributing Factors
Beyond the specific injuries above, a few additional factors are worth paying attention to, since they often compound the risk of the issues described earlier:
- Footwear that doesn’t match your foot type or running gait, which can alter how forces travel through your ankle — this is especially relevant if you overpronate, in which case reviewing the best shoes for overpronation can make a meaningful difference.
- A poor or rushed warm-up, which leaves muscles and tendons less prepared to absorb impact.
- Inadequate nutrition or hydration, which affects tendon and bone health over time.
- General fatigue or overtraining, which reduces coordination and increases the likelihood of an awkward step or fall.
