Back-of-Heel Pain That Won’t Settle? Achilles Tendon vs Heel Bursa Pain Explained

Pain at the back of the heel can be surprisingly difficult to pin down. You may notice it when taking your first steps in the morning, walking uphill, climbing stairs, running, or simply when the back of your shoe presses against the heel.

Two conditions are particularly likely to enter the conversation: insertional Achilles tendinopathy and retrocalcaneal bursitis.

They occur within only a small distance of one another, can cause similar symptoms and may even exist at the same time. Yet they involve different structures.

Insertional Achilles tendinopathy affects the lowest part of the Achilles tendon where it attaches to the heel bone. Retrocalcaneal bursitis affects a small cushioning sac positioned between the Achilles tendon and the heel bone. Understanding that anatomical difference helps explain why some people experience pain directly over the tendon while others feel a deeper, more diffuse pain on either side of it.

The distinction matters because although treatment overlaps, the way the heel is loaded and compressed may need to be handled differently.

The Achilles tendon is the strong tendon connecting the calf muscles to the calcaneus, or heel bone. Every time you walk, climb stairs, run or rise onto your toes, the Achilles tendon transfers force from the calf to the foot.

At its lowest point, the tendon attaches directly to the posterior heel. Immediately in front of the tendon is the retrocalcaneal bursa, a small fluid-filled structure that helps reduce friction between the Achilles tendon and the heel bone.

That means several structures capable of producing pain are crowded into a very small area.

Back-of-heel pain may originate from:

Insertional Achilles tendinopathy, retrocalcaneal bursitis, a prominent upper portion of the heel bone commonly associated with Haglund deformity, calcification within the Achilles tendon, irritation of the superficial tissues from footwear, a partial Achilles tendon tear, inflammatory arthritis or, less commonly, a heel-bone stress injury.

For this reason, simply saying that someone has “Achilles pain” does not necessarily identify what is actually irritated.

Insertional Achilles tendinopathy is a painful disorder involving the portion of the Achilles tendon where it attaches to the heel bone, generally within approximately the lowest two centimeters of the tendon.

The tendon may become thickened and develop changes in its collagen structure. Calcification or small bone spurs may also occur around the attachment over time. The problem is not simply an inflamed tendon. Chronic Achilles tendinopathy involves structural changes within the tendon and altered ability to tolerate mechanical loading.

People sometimes still use the term insertional Achilles tendonitis, but “tendinopathy” is generally a better description for a persistent problem because inflammation is not necessarily the main process responsible for chronic symptoms.

The most characteristic symptom is pain directly where the Achilles tendon attaches to the back of the heel.

Someone with insertional Achilles tendinopathy may describe:

Pain during the first several steps after getting out of bed, Stiffness after sitting for a long time, Tenderness when pressing directly over the Achilles insertion, Pain when walking uphill or climbing stairs, Discomfort when running or jumping, Swelling or thickening at the tendon attachment, Pain when the heel counter of a shoe presses against the area

A common pattern is for the tendon to feel stiff and painful at the beginning of activity, loosen somewhat after a few minutes and then become painful again after prolonged walking or exercise.

Some people notice a firm bump at the back of the heel. This can represent thickened tendon, calcification, an enthesophyte or a prominence of the upper heel bone.

Retrocalcaneal bursitis means irritation and inflammation of the bursa located between the Achilles tendon and the calcaneus.

The bursa normally allows the Achilles tendon to glide more smoothly over the heel bone. Repeated compression, friction or excessive mechanical loading can irritate it and cause pain and swelling.

Unlike insertional Achilles tendinopathy, where the tendon itself is the main structure involved, retrocalcaneal bursitis primarily affects this fluid-filled cushioning sac.

Retrocalcaneal bursitis commonly causes deep pain immediately in front of the Achilles tendon near the heel bone.

The area may feel swollen, warm or tender. Because the bursa sits deep to the tendon, swelling may become noticeable along the medial and lateral sides of the Achilles rather than appearing only directly over the tendon.

Pain may be especially noticeable when the ankle bends upward, because this position can compress structures between the Achilles tendon and the heel bone. A clinician may also reproduce pain by gently squeezing the soft tissues from the sides just in front of the Achilles tendon.

Walking, running, standing on tiptoe and wearing shoes that press against the heel may all aggravate symptoms.

Location provides one of the most useful clues.

With insertional Achilles tendinopathy, tenderness tends to be directly over the Achilles tendon where it connects to the heel.

With retrocalcaneal bursitis, the pain can feel deeper and may be more noticeable slightly forward of the tendon or along either side of it.

That distinction sounds straightforward on paper but can be much less obvious in real life.

The Achilles tendon, retrocalcaneal bursa and heel bone are tightly packed together. Swelling in one structure can irritate another, and people with insertional Achilles tendinopathy frequently have associated changes in the retrocalcaneal bursa. Imaging studies may show both tendon thickening and bursitis in the same heel.

Therefore, it is entirely possible to have both insertional Achilles tendinopathy and retrocalcaneal bursitis at the same time.

Walking uphill requires greater upward bending of the ankle.

As the ankle moves into dorsiflexion, the insertional portion of the Achilles tendon is compressed against the upper surface of the heel bone. This compression appears to be an important mechanical factor in insertional Achilles tendinopathy.

The same position can also narrow the space occupied by the retrocalcaneal bursa.

This explains why activities involving substantial ankle dorsiflexion—such as walking uphill, deep squatting, stair climbing or aggressively stretching the calf—can provoke pain at the back of the heel.

For someone with insertional Achilles tendinopathy, this also explains why an exercise program appropriate for pain higher up the Achilles tendon may not always be appropriate for pain directly at the heel attachment.

A Haglund deformity, sometimes called a Haglund prominence, describes an enlarged or prominent area of bone at the upper back portion of the calcaneus.

This prominence can increase pressure within the already crowded space around the Achilles insertion and retrocalcaneal bursa. It may therefore contribute to insertional Achilles tendinopathy, retrocalcaneal bursitis or both.

However, seeing a prominent heel bone on an X-ray does not automatically mean it is responsible for the pain.

Structural abnormalities can exist without producing symptoms. The location of pain, physical examination and overall clinical picture still matter.

This is one reason clinicians should avoid treating an X-ray or magnetic resonance imaging finding in isolation.

Footwear can be an important contributor.

A stiff heel counter may repeatedly press against an already sensitive Achilles insertion or prominent heel bone. Shoes that fit tightly around the back of the ankle can therefore aggravate back-of-heel pain.

Changing footwear does not necessarily cure the underlying tendon problem, but reducing direct pressure can make a substantial difference in irritated heels.

For some people, shoes with a slightly raised heel or temporary heel lifts may reduce both Achilles tendon strain and compression around the insertion. Open-backed footwear may temporarily reduce irritation where direct shoe pressure is a major contributor.

Insertional Achilles tendinopathy often develops when the tendon is repeatedly exposed to more load than it can comfortably tolerate.

A sudden increase in walking, running, hill training or sporting activity can trigger symptoms. However, pain can also appear after a period of reduced activity when the tendon has lost some of its capacity and the person suddenly returns to previous activity levels.

Factors that may contribute include calf weakness, reduced ankle mobility, changes in training volume, repetitive jumping or running, increased body weight, certain medical conditions and the anatomy of the heel itself.

Importantly, the problem is not always caused by “overuse” in the traditional sense. A tendon can also become relatively underprepared for ordinary activity after illness, inactivity or prolonged rest.

Retrocalcaneal bursitis frequently results from repeated irritation or compression between the Achilles tendon and calcaneus.

Running, repetitive walking, poorly fitting footwear and a prominent posterior heel may contribute.

Inflammatory conditions can also cause bursitis. Rheumatoid arthritis, gout and other inflammatory disorders can involve the retrocalcaneal region.

If heel pain occurs on both sides, appears without an obvious mechanical trigger or is accompanied by pain and stiffness in multiple joints, a clinician may therefore consider whether a systemic inflammatory condition needs to be investigated.

In many cases, a diagnosis can be made from the history and physical examination without immediately ordering a scan.

Insertional Achilles tendinopathy becomes more likely when symptoms are localized to the lowest portion of the Achilles tendon, loading the tendon causes pain, the tendon insertion is tender and there is localized thickening.

Retrocalcaneal bursitis becomes more likely when the tenderness is deep to the Achilles tendon and especially when medial-to-lateral compression around the tendon reproduces the pain. Maximum ankle dorsiflexion may also increase symptoms by compressing the bursa.

A clinician may also assess calf strength, ankle range of motion, the ability to perform a single-leg heel raise and whether there is a palpable or visible prominence at the heel.

Not everyone with back-of-heel pain needs imaging.

When the symptoms and examination clearly fit Achilles tendinopathy, imaging may add little during the initial assessment. Scans become more useful when the diagnosis is uncertain, symptoms do not improve as expected, a tendon tear or stress fracture is suspected, or surgery is being considered.

An X-ray can show calcification within the Achilles insertion, bone spurs and a prominent posterosuperior calcaneus.

An ultrasound can demonstrate tendon thickening, abnormal tendon structure, calcification and fluid or thickening within the retrocalcaneal bursa.

Magnetic resonance imaging provides detailed information about the tendon, bursa, heel bone and surrounding tissues and may be particularly useful when several possible causes of posterior heel pain need to be distinguished.

One important point is that abnormal-looking tendons do not always hurt. Imaging abnormalities can be found in people without symptoms, so scans must be interpreted together with the clinical examination.

The cornerstone of treatment is usually progressive Achilles tendon loading, not complete long-term rest.

Temporarily reducing activities that strongly provoke symptoms may be necessary, particularly hills, running, jumping or repeated stair climbing. However, the eventual goal is to gradually rebuild the tendon’s capacity to tolerate load.

Modern rehabilitation for insertional Achilles tendinopathy also pays attention to compression at the tendon insertion.

Traditional Achilles heel-drop exercises performed from the edge of a step allow the heel to drop well below the forefoot. That may be useful for some forms of Achilles tendinopathy but can create excessive compression when the problem is located directly at the insertion.

For insertional Achilles tendinopathy, strengthening exercises are often initially performed on a flat surface or with the heel slightly elevated so that the ankle does not move deeply into dorsiflexion.

More recent clinical trial evidence supports this principle. A rehabilitation program that limited Achilles compression through controlled ankle dorsiflexion, progressive loading and heel lifts produced greater improvements in pain and function than a program involving greater tendon compression in people with chronic insertional Achilles tendinopathy.

This does not mean the ankle should permanently avoid dorsiflexion. As symptoms improve and tendon capacity increases, range of motion can gradually be restored.

When retrocalcaneal bursitis is the dominant problem, the early priority is often reducing irritation and pressure on the bursa.

That may involve temporarily reducing aggravating activity, changing footwear, avoiding rigid heel counters, using appropriate heel cushioning or heel lifts, and applying cold therapy when the area is acutely irritated.

Anti-inflammatory medication may sometimes be appropriate for bursitis because inflammation plays a more direct role than it does in chronic Achilles tendinopathy. Whether these medicines are suitable depends on the person’s medical history and other medications.

Rehabilitation may still be needed because Achilles loading, calf weakness, ankle mechanics and activity levels can contribute to ongoing irritation.

In persistent cases, a clinician may consider an injection directly into the retrocalcaneal bursa. However, this is an area where precision matters. Corticosteroid should not be injected into the Achilles tendon itself, because injecting the tendon can weaken it and increase the risk of tearing or rupture.

For that reason, injections around the Achilles region should only be considered after appropriate medical assessment and performed with careful attention to anatomy.

This is an important distinction.

Many people assume that any tight or painful Achilles tendon needs aggressive calf stretching. With insertional Achilles tendinopathy, however, deep dorsiflexion can increase compression of the tendon against the heel bone.

Aggressive stretching may therefore aggravate symptoms during an irritable stage.

Recent rehabilitation research supports initially reducing high-compression positions, including excessive ankle dorsiflexion, while progressively loading the tendon within a more comfortable range.

Stretching does not necessarily have to be avoided forever. It can be reintroduced gradually when appropriate.

Both insertional Achilles tendinopathy and retrocalcaneal bursitis can improve, but chronic Achilles problems often require patience.

Tendons adapt more slowly than muscles. Someone who has had insertional Achilles pain for several months should not necessarily expect it to disappear after a week or two of exercises.

Progress is usually judged by trends rather than by whether every step is pain-free. Morning stiffness may gradually decrease, walking tolerance may improve, heel raises may become easier and post-activity pain may settle more quickly.

The rehabilitation process often extends over several months, particularly when symptoms have been present for a long time.

A sudden increase in activity once the heel starts feeling better is one of the easiest ways to flare symptoms again. Gradual progression tends to be more successful.

Most patients are initially treated without surgery.

Surgery may be considered when persistent insertional Achilles tendinopathy causes substantial functional limitation despite an adequate period of structured conservative treatment.

Depending on the underlying problem, surgery may involve removing damaged tendon tissue, removing calcification, addressing a prominent area of heel bone, decompressing the retrocalcaneal bursa and repairing the Achilles tendon.

Conservative treatment remains the first-line approach, although surgery can be effective in appropriately selected patients whose symptoms do not respond to nonsurgical care.

Not every painful Achilles area is tendinopathy or bursitis.

Sudden severe pain accompanied by a snapping or popping sensation, difficulty walking or inability to push off the affected foot raises concern for an Achilles tendon rupture and warrants prompt medical assessment.

A medical evaluation is also important if pain follows significant trauma, the heel becomes markedly red and hot, there is unexplained fever, symptoms rapidly worsen, or pain remains persistent despite reasonable activity modification.

Other conditions such as partial Achilles tendon tears, calcaneal stress fractures, inflammatory arthritis, gout and posterior ankle disorders can occasionally mimic insertional Achilles tendinopathy or retrocalcaneal bursitis.

Perhaps the most important point is that insertional Achilles tendinopathy versus retrocalcaneal bursitis is not always an either-or diagnosis.

The tendon and bursa occupy the same small anatomical space. A thickened Achilles tendon, a prominent heel bone and repeated compression can irritate the bursa. Conversely, inflammation and swelling around the retrocalcaneal space can increase sensitivity around the Achilles insertion.

Ultrasound and magnetic resonance imaging often demonstrate combinations of tendon degeneration, calcification, heel-bone prominence and retrocalcaneal bursitis rather than one isolated abnormality.

This is why treatment should be based on the complete clinical picture rather than simply on the name attached to a scan finding.

If you have pain at the back of the heel, the exact location can offer an important clue.

Pain centered directly over the attachment of the Achilles tendon is more suggestive of insertional Achilles tendinopathy. Pain that feels deeper, particularly just in front of the Achilles tendon or along either side of it, may be more consistent with retrocalcaneal bursitis.

But the two frequently overlap.

Both conditions can become worse with excessive Achilles loading, ankle dorsiflexion, hills and irritating footwear. A prominent heel bone may further compress the region.

The treatment approach often begins with reducing the activities and positions that repeatedly irritate the heel, improving footwear and progressively rebuilding Achilles strength. In insertional Achilles tendinopathy, avoiding excessive dorsiflexion during the early stages of strengthening can be particularly important.

Persistent back-of-heel pain should be evaluated rather than treated indefinitely as a generic “Achilles problem.” Identifying whether the tendon, bursa, heel bone—or a combination of these structures—is responsible can make rehabilitation considerably more targeted.

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