Heel Fat Pad Atrophy: When Heel Pain Isn't Plantar Fasciitis

Not all heel pain is plantar fasciitis. That sentence has saved a lot of my patients months of frustration. If you've stretched, iced, worn the night splint, done everything the internet told you to do for plantar fasciitis — and your heel still aches — it's worth asking whether you ever had plantar fasciitis in the first place. One of the most commonly missed answers sits right under your heel bone: fat pad atrophy.

Your Heel's Built-In Shock Absorber

Under your heel bone is a specialized cushion of fat unlike any other fat in your body — organized into tiny sealed chambers that compress and rebound with every step, like bubble wrap engineered by nature. In a young foot it's thick and springy. With age, years of impact, certain medical conditions, and sometimes after repeated cortisone injections into the heel, those chambers can break down and thin out. When the padding thins, your heel bone starts taking the hits directly. That's fat pad atrophy, and a 2021 case series in The Foot describes it as the second most common cause of pain under the heel, right behind plantar fasciitis.

How It Feels Different From Plantar Fasciitis

The two conditions get mixed up constantly, but they don't actually feel the same. A few honest tells:

Where it hurts. Plantar fasciitis pain classically sits toward the inside front edge of the heel, where the fascia attaches. Fat pad pain sits dead center under the heel — right where you land.

When it hurts. Plantar fasciitis is famous for the brutal first steps out of bed that ease as you warm up. Fat pad pain tends to be the opposite: not bad first thing, worse the longer you're on your feet, and worst on hard surfaces — tile floors, concrete, the barefoot-all-summer lifestyle we love here in Southern California.

The bruise feeling. Patients with fat pad atrophy often say it feels like walking on a stone bruise, or like the bone itself is hitting the floor. Sometimes you can actually feel the heel bone's edge through the skin more easily than on the other foot.

Of course, some unlucky heels have both problems at once — which is exactly why a hands-on exam matters. If you want the fuller picture of heel pain causes, our heel pain treatment page covers the whole family.

Why the Diagnosis Changes the Treatment

Here's the part that matters most: some of the standard plantar fasciitis playbook doesn't help fat pad atrophy — and one piece of it can make things worse. Aggressive fascia stretching does nothing for a thinned cushion. And repeated corticosteroid injections into the heel are used very cautiously in this setting, because steroid can thin the fat pad further. If your heel pain hasn't budged on the usual routine, that's a signal to re-examine, not to push harder.

What Actually Helps

Replace the cushion you've lost. Since the body's padding has thinned, we add padding back from the outside: quality cushioned heel cups, shoes with a well-cushioned, slightly elevated heel, and — for the best fit — custom orthotics built with a deep heel cup and cushioning that cradles what fat pad you still have and keeps it centered under the bone.

Protect the heel from bare impact. Barefoot on tile and concrete is the enemy. A supportive sandal or house shoe indoors makes a bigger difference than most patients expect — especially in summer.

Calm the irritated tissue. Activity modification and anti-inflammatory strategies help the deep tissue settle while the cushioning does its work. For select chronic cases, we discuss additional options in the office honestly, including whether regenerative injection therapy has a role for the surrounding tissue — with a clear conversation about what the evidence does and doesn't show.

The Bottom Line

Heel pain that ignores plantar fasciitis treatment isn't stubborn — it may simply be a different diagnosis. Fat pad atrophy is common, frequently missed, and very manageable once it's identified: cushion the heel, protect it from hard surfaces, and support it properly. If your heel has been arguing with you all summer, come in and let's figure out which problem you actually have. And if it does turn out to be plantar fasciitis, our night splint guide is a good next read.