Ankle pain has dozens of possible causes, but most cases come down to a handful of common culprits: a sprain, tendon irritation, arthritis, a stress fracture, or nerve compression. The key to narrowing it down is paying attention to exactly where the pain is, when it started, and what makes it worse. Here’s how to sort through the most likely explanations.
Where the Pain Is Matters
Ankle pain isn’t generic. The specific location tells you a lot about what’s going on. Pain on the outside of your ankle most often involves the peroneal tendons, which run along the back and outer edge of the ankle, or residual damage from a sprain. Pain on the inside of your ankle typically points to the posterior tibial tendon, which runs from your calf down behind the bony bump on your inner ankle and into the arch of your foot. Pain at the back of the ankle usually involves the Achilles tendon or a bursa (a small fluid-filled cushion) tucked between the tendon and the heel bone.
If the pain is deep inside the joint and hard to pinpoint, that pattern is more consistent with arthritis or a stress fracture. Pain accompanied by burning, tingling, or numbness on the inner ankle or sole of the foot suggests a nerve issue rather than a bone or tendon problem.
Ankle Sprains
Sprains are the single most common ankle injury. They happen when the ligaments that hold the joint together get stretched or torn, usually after the foot rolls inward. Not all sprains are the same, though, and the severity determines how long you’ll be dealing with it.
A mild (Grade 1) sprain means the ligament is slightly stretched or has a tiny tear. You’ll notice some tenderness, mild swelling, and stiffness, but the ankle still feels stable and you can walk on it with minimal pain. A moderate (Grade 2) sprain involves a partial tear. Expect noticeable swelling, bruising, and tenderness when you touch the area. Walking hurts. A severe (Grade 3) sprain is a complete tear of one or more ligaments. The swelling and bruising are significant, the ankle feels unstable or gives out, and walking may not be possible at all.
If your pain started after a twist, fall, or awkward step, a sprain is the most likely explanation. One important detail: if you can’t put any weight on the ankle, feel tenderness directly over the bony bumps on either side of the ankle, or can’t take four steps, those are the clinical criteria (called the Ottawa Ankle Rules) that indicate you need an X-ray to rule out a fracture.
Tendon Problems
Tendons connect muscle to bone, and the ones around your ankle take a beating during walking, running, and standing. When a tendon gets irritated from overuse, you develop tendonitis, a dull ache that builds gradually and worsens with activity.
The posterior tibial tendon is one of the most commonly affected. It supports your arch and helps with push-off when you walk. When it’s inflamed, you’ll feel pain along the inside of your ankle and into the arch, especially when flexing the foot or trying to rise onto your toes. If the tendon weakens over time, the arch can collapse and the ankle starts rolling inward. A telltale sign of advanced posterior tibial tendon dysfunction is the “too many toes” sign: when someone looks at your foot from behind, they can see more toes splaying outward than normal.
On the outer ankle, the peroneal tendons are prone to similar overuse injuries and often flare up alongside or after ankle sprains. You’ll feel pain around the back and outside of the ankle that worsens with activity.
Achilles tendonitis causes pain at the back of the ankle, right above the heel. It’s sometimes confused with retrocalcaneal bursitis, which produces pain in almost the same spot because the inflamed bursa sits right between the Achilles tendon and the heel bone. Bursitis tends to cause more localized swelling at the back of the heel, while Achilles tendonitis produces stiffness and pain along a longer stretch of the tendon. An MRI can tell the two apart when the distinction isn’t clear.
Stress Fractures
If your ankle pain came on gradually, gets worse with weight-bearing activities like running or jumping, and eases with rest, a stress fracture is worth considering. These are tiny cracks in bone caused by repetitive force rather than a single injury. In the ankle area, stress fractures most commonly affect the navicular bone (in the midfoot, near the ankle) or the talus (the bone that sits between your shin and heel).
Stress fractures in both of these bones are notoriously hard to pinpoint. The pain is often vague and diffuse rather than sharp and localized, which is why they’re frequently misdiagnosed or caught late. They’re more common in runners, dancers, military recruits, and anyone who recently ramped up their activity level. Standard X-rays sometimes miss them early on, so an MRI or bone scan may be needed.
Arthritis
Ankle arthritis develops slowly. You won’t wake up one morning knowing you have it. Instead, you’ll notice a gradual pattern: stiffness that’s worst first thing in the morning or after sitting for a long time, then loosens up once you start moving. Over time, the joint may swell, feel warm, become tender to the touch, and lose range of motion.
Osteoarthritis in the ankle is less common than in the knee or hip, but it frequently develops after a previous injury, even one that happened years ago. A badly sprained ankle in your twenties can set the stage for arthritis in your forties. Inflammatory types of arthritis, like rheumatoid arthritis or gout, tend to cause symptoms in flares that come and go rather than the constant low-grade ache of osteoarthritis.
Nerve Compression
If your ankle pain comes with burning, tingling, pins-and-needles sensations, or numbness in the sole of your foot or toes, the problem may be a compressed nerve rather than a structural injury. The most common version of this is tarsal tunnel syndrome, where the nerve that runs behind the inner ankle bone gets squeezed.
Tarsal tunnel syndrome typically causes pain on the inside of the ankle and the bottom of the foot. You may also notice weakness in the foot muscles. It can be caused by flat feet, swelling from a sprain, cysts, or anything that takes up space in the narrow passageway (the “tarsal tunnel”) the nerve travels through. The sensory symptoms, burning, tingling, numbness, are what distinguish it from tendon or bone issues.
What to Do Right After an Injury
If your ankle pain started with an obvious injury, the current best practice for the first few days follows the acronym PEACE: protect the ankle by limiting movement for one to three days, elevate the limb above your heart to reduce swelling, avoid anti-inflammatory medications (inflammation is actually part of the healing process, and suppressing it early on may slow tissue repair), compress the area with a bandage or tape, and educate yourself that an active recovery works better than passive treatments like ultrasound or acupuncture.
After those initial days, the approach shifts to LOVE: gradually load the ankle with movement as soon as symptoms allow, stay optimistic (pessimism and fear of re-injury genuinely slow recovery), get your cardiovascular system working with pain-free aerobic exercise to boost blood flow, and start exercises that restore mobility, strength, and balance. For ankle sprains specifically, there is strong evidence that exercise reduces the risk of re-injury.
The old advice to ice aggressively and take ibuprofen right away has fallen out of favor. Rest is still important early on, but prolonged rest weakens the tissue. Pain is your guide: do what you can without making it worse, and gradually do more.
Signs You Need Immediate Care
Most ankle pain resolves on its own or with basic home care. But certain signs mean you should get evaluated quickly: you can’t bear any weight on the ankle, the pain or swelling is severe, there’s visible deformity or exposed bone, or you see signs of infection like redness, warmth, and fever around the joint. Bleeding or an obvious change in the shape of the ankle after an injury means a trip to the emergency room, not a wait-and-see approach.
For pain that isn’t an emergency but has lingered for more than a couple of weeks without improving, or that keeps coming back with activity, imaging and a proper diagnosis will help you stop guessing and start treating the right problem.