Shoes most commonly hurt your Achilles tendon because the rigid back of the shoe presses directly into the tendon or the bursa (a small fluid-filled cushion) that sits between the tendon and your heel bone. This pressure triggers inflammation, and if the irritation continues day after day, it can develop into a persistent problem. The good news is that the fix often comes down to changing what you wear and how you wear it.
How the Back of Your Shoe Causes the Pain
The stiff material at the back of a shoe is called the heel counter. It’s designed to hold your heel in place, but when it’s too rigid or too narrow, it digs into the Achilles tendon with every step. This is especially true of dress shoes, pumps, and some newer running shoes with firm plastic heel cups. The repeated compression irritates the tendon itself and the bursa that cushions it, leading to redness, swelling, and a painful bump right where the shoe edge hits.
If your heel slips inside the shoe, the problem gets worse. Each time your foot lifts, the heel counter drags across the tendon, creating friction on top of the pressure. Over time, this combination can thicken the skin, inflame the bursa, or aggravate the tendon fibers at their attachment point on the heel bone.
Heel Drop and Tendon Load
Every shoe has a “heel-to-toe drop,” which is the height difference between the heel and the forefoot, measured in millimeters. This number quietly determines how much work your Achilles tendon has to do. A higher drop (10 to 12 mm) keeps your heel elevated, shortening the tendon slightly and reducing the strain on it during each stride. A lower drop (0 to 4 mm), common in minimalist shoes, lets your heel sit closer to the ground and forces the tendon to stretch further with every step.
Research on runners found that a 4 mm drop increased the peak load at the ankle compared to 8 mm and 12 mm drops. If you recently switched to a flatter shoe and your Achilles started hurting, this mismatch in drop height is a likely culprit. Your tendon wasn’t conditioned for the extra stretch, and the sudden change overloaded it.
Cushioning stiffness plays a role too. A softer midsole lets your heel sink deeper during impact, which effectively lowers the heel position and increases how far the tendon stretches. A firmer midsole limits that sinking. Neither is inherently better; the issue is abrupt changes your tendon isn’t prepared for.
Two Types of Achilles Pain Feel Different
Where you feel the pain tells you a lot about what’s happening. Insertional Achilles tendinopathy causes pain right at the bottom of the tendon, where it attaches to the heel bone. This is the type most directly aggravated by shoes, because the heel counter sits at exactly that spot. The tendon gets compressed between the shoe and the bone, and the irritation builds with every hour you spend on your feet.
Midportion tendinopathy shows up higher, typically 2 to 6 centimeters above the heel. It’s more related to overuse and training load than to shoe pressure, though a shoe that alters your gait mechanics can contribute. If you can pinch a tender, thickened area in the middle of the tendon, that’s likely the midportion variety. If the pain is right at the heel bone, especially when a shoe presses on it, insertional tendinopathy or bursitis is more probable.
Haglund’s Deformity: The “Pump Bump”
Some people have a bony enlargement on the back of the heel bone that makes shoe-related Achilles pain almost unavoidable with certain footwear. This is called Haglund’s deformity, sometimes nicknamed a “pump bump” because it’s notoriously painful in high heels and other shoes with stiff backs. The bump is visible and easy to feel. It creates a hard ridge that pushes the Achilles tendon outward, making even moderately stiff heel counters feel like they’re digging into the bone.
Signs include a noticeable bump, swelling, skin discoloration around the back of the heel, and pain that worsens specifically when wearing shoes. An X-ray can confirm the bony growth and rule out other causes. If you’ve always had trouble with shoes irritating your Achilles and you can feel a hard lump on the back of your heel, Haglund’s deformity is worth investigating.
Shoe Features That Reduce Achilles Pain
The most important change is getting the heel counter away from your tendon. Look for shoes with a soft, padded collar around the ankle opening and a flexible upper material like mesh or soft leather. Stiff, unyielding backs are the primary offender, so prioritize shoes that give when you press on them at the heel.
Other features that help:
- Moderate heel-to-toe drop (8 to 12 mm): This reduces stretch on the Achilles compared to flat or minimalist shoes.
- Cushioned midsole and heel: Adequate padding absorbs impact and reduces the jarring force transmitted to the tendon.
- Good arch support: A supported arch keeps the foot aligned, preventing the ankle from rolling inward and putting uneven stress on the tendon.
- Flexible sole: A sole that bends with your foot during push-off reduces the amount of force the tendon must generate.
Avoid shoes with a completely flat back or no heel counter at all (like some slip-ons), which allow excessive heel movement and friction. The goal is a heel counter that’s present but soft.
Heel Lifts Can Help Quickly
A simple foam or gel heel lift placed inside your shoe raises your heel, which reduces the stretch on the Achilles tendon and shifts the heel counter’s pressure point slightly. A study of 20 people with insertional Achilles tendinopathy found that 20 mm heel lifts reduced pain during walking immediately after fitting. After two weeks of regular use, participants reported significantly improved symptom severity scores, and their walking speed and stride length both increased. Heel lifts are inexpensive, available at most pharmacies, and worth trying as a first step while you sort out better footwear.
Heel Lock Lacing to Stop Slippage
If your shoes fit well overall but your heel slides up and down, a lacing adjustment can eliminate the friction against your Achilles. The heel lock technique uses the top eyelets of your shoe to anchor the heel in place. Lace your shoes normally up to the second-to-last eyelet, then thread each lace straight up into the top eyelet on the same side to create a small vertical loop. Cross the laces and feed each end through the opposite loop, then pull tight before tying your bow. This draws the shoe snugly around the ankle and locks the heel down, dramatically reducing the back-and-forth rubbing that irritates the tendon.
Strengthening the Tendon Itself
Fixing your shoes addresses the external cause, but the tendon often needs direct attention to heal. Current clinical guidelines list tendon loading exercises as the first-line treatment for Achilles tendinopathy. These are controlled exercises, typically heel raises performed slowly with progressive resistance, that stimulate the tendon to repair and adapt. Education about managing activity levels is equally important; the goal is to keep moving without repeatedly overloading the tendon.
For insertional pain specifically, exercises that compress the tendon against the heel bone (like heel drops off a step edge) can sometimes make things worse. Flat-ground heel raises are generally better tolerated in the early stages. Passive treatments like ice, massage, or taping have limited evidence on their own but can be useful alongside exercise for managing day-to-day discomfort.