Pain Inside Side of Foot: Common Causes and What Helps

Pain inside side of foot is a common reason people start to dread their morning walk. The inner edge carries a lot of weight at every step, so several different structures can get sore there. Plantar fasciitis, one frequent cause of heel and arch pain, is most often found in working adults between 25 and 65 (StatPearls, 2023). Many other causes share the same inner border.

Common causes of pain inside side of foot

The tibialis posterior tendon. This tendon runs behind the bony bump on the inner ankle and down into the arch. It helps hold the arch up as you walk. When it is overworked, the inner ankle and arch can feel sore. Over time, the arch may begin to flatten.

Plantar fasciitis. The plantar fascia is a thick band under the foot. When it is irritated, pain often sits at the inner heel. It is typically worst with the first steps after getting up in the morning.

A bunion. This is a bony bump at the base of the big toe. The joint can be tender, and shoes that press on the bump make it worse.

An accessory navicular. Some people are born with a small extra bone on the inner midfoot. Most never notice it. Shoes that press on it can irritate the area.

Tarsal tunnel syndrome. A nerve passes through a narrow space at the inner ankle. When it is squeezed or irritated, you may feel burning, tingling or numbness on the inner ankle and the sole.

A stress fracture is also possible, especially after a sudden jump in walking or running. A doctor or podiatrist can tell these apart. A good description of where it hurts and when helps them a lot.

When to see a doctor first

Get the foot checked urgently if the pain is sudden and severe, if it began after an injury or a pop, or if you cannot put weight on the foot. The same goes for a hot, red, swollen foot, and for numbness. If you have diabetes, any foot pain or wound should be looked at promptly.

Everything below is for the slow, grumbling kind of pain that builds with use and eases with rest.

How weight travels through your foot

Each step, your weight rolls from the heel toward the big toe. Along the way, the foot adapts to the ground. The ankle, knee and hip all share this work. When one of them moves less, the foot often takes on more.

For example, a stiff ankle or a hip that does not swing freely can leave the foot to manage alone. Some people also let their weight fall onto the inner edge again and again, without noticing. Our Feldypedia entry on gait changes and walking difficulty describes how these small adjustments build up over the years.

A gentle place to begin

Sit with both bare feet flat on the floor. Without lifting the foot, let your weight drift a little toward the big toe side. Then let it drift toward the little toe side, and back to the heel. Keep the movement tiny, a few millimetres at most.

Notice which parts of the sole you can feel clearly. Notice which parts feel faint. Stay within comfort. If anything hurts, make the movement smaller or rest.

Later, try it standing, with your knees soft. Roll your weight slowly between the inner and outer edge of each foot. Then take a few slow steps and let your ankle, knee and hip share the work. The Feldenkrais Method® takes this approach. It does not treat the sore tissue. It helps you sense how you use your foot, and many people find the load then feels more evenly shared.

Feldy offers gentle audio lessons in this spirit. Our somatic exercises for beginners teach the same skill in a full lesson.

Everyday things worth noticing

Look at your shoes. Choose a pair that is supportive and comfortable, with room for the toes and nothing pressing on a bump. Worn out shoes can add to the strain.

Build up walking and running slowly. A sudden increase is a common trigger for sore feet. If the pain is on a different part of the foot, our guides to pain on the outer foot when walking and foot arch pain cover those areas.

Find where to start

You may not know yet what kind of movement suits your feet and your days. Three quick questions are enough to point you toward somewhere to begin.

Not sure which movement method fits you? Take the 60-second Movement Match quiz, which asks about your feet and your days and then names a method to explore.

Common Questions about pain inside side of foot (FAQ)

What causes pain inside side of foot?

The common sources are the tibialis posterior tendon, which runs behind the inner ankle bone to the arch, the plantar fascia near the inner heel, a bunion at the big toe joint, an accessory navicular (a small extra bone on the inner midfoot), and an irritated nerve at the inner ankle. A doctor or podiatrist can tell these apart.

Is pain on the inside of the foot serious?

Often it is a gradual, load related irritation. It becomes more serious when pain starts suddenly, follows an injury or a pop, stops you putting weight on the foot, or comes with a hot, red, swollen foot or numbness. Those signs need a doctor promptly.

Is it safe to keep walking on it?

When walking feels easy and the ache eases with rest, gentle walks on flat ground are usually reasonable. If you limp, if the pain grows day by day, or if it hurts at rest, stop and have it checked. A stress fracture can follow a sudden rise in walking or running.

What is the best exercise for pain on the inside of the foot?

A good starting point is slow weight sensing while seated. Rest the bare foot flat and let your weight drift a few millimetres toward the big toe side, then the little toe side, then the heel. It asks nothing from the sore area and trains your attention. If it hurts, make the movement smaller or stop.

What should I avoid with inner foot pain?

Avoid sudden jumps in walking or running distance, long spells in worn, unsupportive shoes, and pressing hard into a sore spot. Do not push through sharp pain. If a shoe rubs a bump on the inner edge, give that area some relief.

How long does inner foot pain take to settle?

It depends on the cause, and a professional can give a better estimate. A mildly irritated tendon often quietens over weeks once the load eases, while a bunion, an extra bone or a nerve problem can take longer. Pain that is not improving after a few weeks is worth having assessed.

How is awareness work different from insoles or stretching?

Insoles and supportive shoes change what is under the foot, and many people find them useful. Awareness work changes how you notice and share weight through the foot, ankle, knee and hip. The two sit together well, and neither replaces a diagnosis.