A pump bump is a bony enlargement on the back of the heel, right where the Achilles tendon attaches to the heel bone. Its medical name is Haglund’s deformity, but it picked up the nickname “pump bump” because rigid-backed shoes like high heels (pumps) press directly against it and make it painful. The bump itself is bone, not a blister or callus, and it can become inflamed enough to make walking in closed shoes miserable.
What Causes a Pump Bump
The bump forms when the upper back corner of the heel bone (calcaneus) becomes enlarged or abnormally prominent. That extra bone then rubs against footwear and irritates the soft tissues around it, including a small fluid-filled sac called the retrocalcaneal bursa that sits between the bone and the Achilles tendon. When that bursa swells, the pain and visible swelling get noticeably worse.
Several factors raise your risk:
- Tight, rigid-backed shoes. High heels, dress shoes, ice skates, and stiff work boots all press repeatedly against the same spot on the heel bone.
- High-arched feet. A high arch tilts the heel bone backward, pushing the upper edge of the bone into the Achilles tendon and bursa.
- A tight Achilles tendon. Less flexibility in the tendon increases friction and compression against the bone.
- Overuse. Runners and other athletes who log heavy mileage put repetitive stress on the area.
- Gait abnormalities. Certain walking patterns shift pressure toward the back of the heel.
What It Looks and Feels Like
The most obvious sign is a visible, hard bump on the back of the heel. In clinical cases, that bump is accompanied by redness, warmth, swelling, and tenderness when you press on it. Some people also notice a decreased range of motion in the ankle, especially when flexing the foot upward. The pain tends to be worst when wearing shoes with a firm heel counter and often improves in open-backed shoes or sandals.
A pump bump can exist without causing much trouble. Some people have the bony prominence but rarely experience pain, while others develop chronic inflammation that flares with any enclosed footwear. The severity often depends on how much pressure your shoes apply and how tight your Achilles tendon is.
Pump Bump vs. Bursitis vs. Achilles Tendonitis
These three conditions overlap and often occur together, which can make things confusing. A pump bump (Haglund’s deformity) is specifically the bony enlargement. Retrocalcaneal bursitis is the inflammation of the bursa that sits just in front of the bump. Achilles tendonitis is irritation of the tendon itself. The term “Haglund’s syndrome” is sometimes used when the bony prominence and bursitis are both present.
The distinction matters for treatment. If you only have bursitis without a significant bony bump, reducing inflammation may fully resolve the problem. If an oversized bone is mechanically irritating the bursa and tendon, the inflammation is likely to return whenever footwear pressure increases.
How It’s Diagnosed
A doctor can usually identify a pump bump through a physical exam, feeling the hard prominence and checking for tenderness and swelling. An X-ray confirms it. Radiologists measure specific angles on the lateral (side-view) X-ray to determine whether the bony prominence is abnormally large. One commonly used measurement, the Fowler-Philip angle, is normally between 44 and 69 degrees. Values above 75 degrees suggest a pathological Haglund’s deformity. Another measurement looks at the height of the bump itself: a prominence of 4 millimeters or more above a reference line on the X-ray is considered the threshold for a true Haglund’s deformity.
Non-Surgical Treatment
Most people start with conservative measures, and many get enough relief to avoid surgery entirely. The first-line approach combines anti-inflammatory medication, activity modification, and changes to your shoes. Switching to footwear with a soft back or an open heel removes the direct pressure that triggers inflammation. Avoiding high heels and rigid-backed shoes is the single most impactful change for many people.
Heel lifts placed inside shoes can reduce tension on the Achilles tendon, though the evidence for their effectiveness is mixed. Night splints, which hold the ankle in a gently stretched position while you sleep, are another option. Physical therapy focused on eccentric Achilles strengthening exercises has good support for reducing symptoms over time.
Exercises That Help
Stretching and strengthening the Achilles tendon and calf muscles reduces the mechanical pressure on the bump. These exercises can be done daily at home:
Calf wall stretches: Stand slightly farther than arm’s length from a wall with both hands on it. Step one foot forward, keep the back leg straight, and press both heels into the floor until you feel a stretch in the back calf. Hold for 30 seconds and switch sides. You can repeat this five or six times a day.
Standing heel raises: Balance on the balls of your feet, slowly rise up onto your toes, hold for several seconds, then lower back down. This strengthens the calves while gently stretching the tendon. Up to 25 repetitions a day is reasonable as long as there’s no pain.
Towel stretches: Sit on the floor with your legs extended. Loop a towel around the ball of one foot and gently pull back until you feel a stretch in the calf. Hold 30 seconds, then switch. This provides a deeper Achilles stretch and can be done five or six times daily.
Heel drops: Stand on a step with your heels hanging off the edge. Rise onto your toes on one leg, then slowly lower the opposite heel below step level. This eccentric motion builds controlled strength through the full range. Three sets of 15 repetitions per day is a typical goal.
The key with all of these is slow, controlled movement. Bouncing or pushing through sharp pain is counterproductive.
When Surgery Becomes an Option
If several months of conservative treatment haven’t provided enough relief, surgery may be considered. The two main approaches are removing the bony bump directly (calcaneal ostectomy) or reshaping the heel bone through a wedge osteotomy that decompresses the area without cutting near the Achilles tendon insertion. The wedge technique avoids dissecting tissue around the tendon, which can reduce certain complications, though bump removal is more straightforward.
Recovery after surgery is substantial. You’ll typically need to stay off the operated leg entirely for the first four weeks. Weight-bearing starts gradually after that. Running is generally possible around six months, and a return to full sport takes roughly nine months. This timeline is a significant commitment, which is why most surgeons and patients exhaust conservative options first.
Footwear Tips to Prevent Flare-Ups
Whether you’re managing a pump bump conservatively or recovering from surgery, shoes matter more than almost anything else. Look for shoes with soft, flexible heel counters or no heel counter at all. Open-backed clogs, certain athletic shoes with padded collars, and sandals all take pressure off the bump. If you need closed-back shoes for work, adding a gel heel pad or moleskin over the bump area can reduce friction. Rigid dress shoes, ice skates, and high heels are the most common offenders and worth avoiding whenever possible.