Posterior tibial tendonitis typically feels like a dull, aching pain along the inner side of your ankle and foot, running from just behind the bony bump on the inside of your ankle down toward your arch. Early on, the pain shows up during or after activity and fades with rest. As the condition progresses, the pain can become constant, and you may notice your foot changing shape as your arch flattens.
Where the Pain Shows Up
The posterior tibial tendon runs from your calf muscle, curves behind the inner ankle bone (the medial malleolus), and attaches to bones on the underside of your foot. That path is exactly where you’ll feel symptoms. Most people first notice a sore, tender spot just behind and below the inner ankle bone. The discomfort often radiates downward along the tendon’s path into the arch of the foot.
This location is important because it helps distinguish the condition from plantar fasciitis, which centers on the bottom of the heel. If your pain is concentrated along the inner ankle rather than directly under the heel, posterior tibial tendonitis is more likely. You may also notice mild warmth or puffiness along that inner ankle area, following the line of the tendon.
What the Pain Actually Feels Like
In the early stages, the sensation is usually a deep, achy soreness rather than a sharp or stabbing pain. It tends to build gradually during weight-bearing activities: walking, running, climbing stairs, or standing for long stretches. Many people describe it as a fatigue-like ache in the inner ankle that worsens the longer they stay on their feet. High-impact activities and walking on uneven surfaces make it worse because the tendon has to work harder to stabilize your foot.
You may also feel stiffness in the morning or after sitting for a while, with the first several steps feeling tight and uncomfortable along the inner ankle. Unlike the sharp “first step” pain of plantar fasciitis that often eases after a few minutes of walking, posterior tibial tendonitis pain tends to linger and worsen with continued activity rather than warming up and improving.
As the condition advances, the pain can shift. Some people start feeling soreness on the outer side of the ankle as well. This happens because the arch collapses and the heel tilts outward, compressing structures on the outside of the ankle joint. At that point, the pain picture becomes more complex and harder to pinpoint.
How Symptoms Change Over Time
Posterior tibial tendon dysfunction is a progressive condition, meaning it gets worse in stages if left untreated. The symptoms you feel change meaningfully at each stage.
Stage 1: The tendon is inflamed but still intact. You feel pain and mild swelling along the inner ankle, mostly during or after activity. Your arch looks normal, and you can still stand on one foot and rise onto your toes, though it may be uncomfortable. This is the stage most people are in when they first search for answers.
Stage 2: The tendon has stretched or partially torn, and your arch begins to visibly flatten. You’ll notice it’s difficult or impossible to do a single-leg heel raise on the affected side. Your foot may start turning outward, a change sometimes called the “too many toes” sign because someone standing behind you can see more toes peeking out on the affected foot than on the healthy one. The arch is still flexible at this point, meaning it can be manually repositioned, but it no longer holds itself up during standing.
Stage 3: The arch collapse becomes rigid. The foot is stuck in its flattened, turned-out position. Pain often shifts to the outer ankle as bones start pressing against each other on that side. Arthritis begins developing in the joints of the midfoot and hindfoot.
Stage 4: The ankle joint itself becomes involved, tilting to one side. Pain is widespread through the ankle and foot, and walking becomes significantly limited.
Most people seek help during stage 1 or 2. The progression from one stage to the next can take months to years, and early treatment can slow or stop it.
A Simple Test You Can Try at Home
The single-leg heel raise is the most telling self-check for posterior tibial tendon integrity. Stand near a wall or counter for balance. Lift your unaffected foot off the ground so you’re standing on the symptomatic leg with your knee straight. Now try to rise up onto your toes, hold for a few seconds, and lower back down. A healthy posterior tibial tendon lets you do this repeatedly without much trouble.
If you can’t rise onto your toes at all, feel significant pain trying, or notice that your heel doesn’t turn slightly inward as you rise (which it normally does), that suggests the tendon is weakened or damaged beyond simple inflammation. Compare both sides. A clear difference in strength or comfort between your two feet is a meaningful finding.
Who Gets This and Why
Posterior tibial tendonitis is most common in middle-aged adults and develops from a combination of factors rather than a single cause. Age-related wear on the tendon is the primary driver, as the tendon gradually loses its organized structure over decades of use. Obesity adds load to a tendon that already works hard during every step. High blood pressure, diabetes, and previous ankle injuries all increase risk, likely because they affect blood flow to the tendon or change the quality of the tendon tissue itself. Diabetes in particular leads to disorganized collagen, tendon thickening, and calcification, all of which weaken the tendon over time.
Repeated steroid injections near the tendon and certain genetic factors also play a role. Women are affected more often than men, though the reasons aren’t entirely clear.
What Helps and What to Expect
In the early stages, treatment is conservative and centered on reducing strain on the tendon. That typically means rest from aggravating activities, supportive footwear, and arch-supporting insoles or a custom orthotic to take pressure off the tendon. A structured ankle brace or walking boot may be recommended for several weeks to let the inflammation settle.
Physical therapy focuses on gradually strengthening the tendon and the muscles around the ankle that help support the arch. Exercises like eccentric calf raises and balance work are common staples. Recovery from stage 1 typically takes 6 to 12 weeks of consistent effort, though some people notice improvement sooner. Stage 2 takes longer and may require a more rigid brace for months.
If conservative treatment doesn’t improve symptoms after several months, or if the tendon has torn significantly, surgical options range from tendon repair to procedures that realign the bones of the foot. Recovery from surgery involves weeks of non-weight-bearing followed by a gradual return to activity, often spanning 6 to 9 months total before you’re back to full function.
How It Differs From Similar Conditions
Inner ankle and foot pain has several possible causes, and the overlap can be confusing. Plantar fasciitis produces pain on the bottom of the heel, worst with the first steps in the morning, and typically improves as you move around. Posterior tibial tendonitis pain lives along the inner ankle and arch, and it gets worse, not better, with continued activity.
Tarsal tunnel syndrome involves compression of a nerve in the same inner ankle area, but it produces tingling, numbness, or burning sensations that may radiate into the sole of the foot. Posterior tibial tendonitis feels more like a deep muscular ache with tenderness you can press on, without the electrical or buzzing quality of nerve pain.
Ankle sprains affect the outer ankle in most cases and come on suddenly after a twist or roll. Stress fractures produce pinpoint bone tenderness and hurt with every step. If your pain is a broad ache along the inner ankle that built up gradually over weeks, posterior tibial tendonitis is the most likely explanation.