What causes plantar fasciitis?
The plantar fascia is a thick band that spans the bottom of your foot and helps it work like a spring. It gets irritated when the demand placed on it outruns what it can currently tolerate. That is why the story is almost never the heel alone. It is the calf, the foot, the shoes, and whatever you added to your week a month ago.
Fascia adapts, but slowly, and it does not like surprises. A training block that adds distance too fast, a new job on a concrete floor, a spring of yard work, a summer of long walks on soft sand: each one raises demand quicker than the tissue can build tolerance. This is the most common story we hear. It also explains why rest alone rarely settles it, because rest lowers tolerance further while your week goes right back to what it was.
Every step asks your ankle to bend forward as your body passes over the foot. When the calf is tight or the ankle joint is stiff, that motion has to come from somewhere, and the arch pays for it by stretching further and for longer than it should. Calf strength matters as much as calf length, because a strong calf absorbs load the fascia would otherwise take. It is why heel pain plans built only on stretching tend to stall.
Feet come in different shapes and none of those shapes is a diagnosis. What matters is control: whether the small muscles of the foot and the bigger muscles at the hip can hold the arch through a step instead of letting it collapse and snap back. A foot that flattens fast and a foot that stays rigid both send more strain through the fascia, just in different spots. We test yours rather than guess from a footprint.
Shoes wear out from the inside, so a pair that felt fine in March can be doing very little by October. Switching suddenly from supportive work boots to flat sandals changes the demand on the fascia overnight, and so does a winter of slippers on hardwood. We are not here to sell you an insert. We look at what you actually wear for work, for walking and for training, and change what is adding load while the tissue is sensitive.
Plenty of people are told they have a heel spur and assume the spur is the problem. Spurs are common findings. They show up in feet that hurt and in feet that never have, and taking one out is rarely the conversation. Pain tracks with what the fascia and the calf can tolerate far more closely than with what an image shows. That is good news, because tolerance is the part we can change.
