Sudden heel pain without injury usually builds from repeated load rather than one event. Load accumulates for weeks, then crosses a threshold, so the pain feels sudden although the process was not. Where it hurts narrows the cause fast. The bottom of the heel points one way, the back another, and burning or tingling points to a nerve rather than a tissue.

Where on the heel does it hurt?

Use this as a starting map, not a diagnosis.

• Bottom of the heel, at the front: plantar fasciitis
• Bottom of the heel, central and deep: fat pad irritation or thinning
• Back of the heel, low, at the tendon: insertional Achilles tendinopathy
• Back of the heel, higher, with a bump: retrocalcaneal bursitis or Haglund’s deformity
• Sides of the heel, sore when squeezed: a possible calcaneal stress fracture
• Anywhere, with burning or tingling: a nerve problem

Bottom of the heel, front, worst on your first steps

This is plantar fasciitis, irritation of the thick band of tissue running from the heel along the sole to the toes. The tell is the morning: the first steps out of bed are sharpest, easing as you move and returning after sitting. Tenderness sits in a small spot at the front of the heel bone. It is the most common cause of bottom of heel pain, but not the only one. Our plantar fasciitis guide covers what helps it.

Bottom of the heel, central and deep, sore on hard floors

Under the heel bone sits a pad of fat that acts as a shock absorber. It can be irritated, or lose volume with age and repeated impact, called fat pad atrophy, leaving the bone closer to the ground.

The pain is deep and bruise-like rather than sharp, worse barefoot on tile or concrete, and after a long day standing. There is no first-steps pattern, and tenderness is central rather than one point. Cushioning matters more here than stretching.

Back of the heel where the tendon attaches

Insertional Achilles tendinopathy is irritation of the tendon where it joins the heel bone. Pain, and often slight thickening, sits low on the back of the heel, worse uphill, on stairs, and in shoes with a firm heel counter. Unlike plantar fasciitis, hard calf stretching often makes it worse, because that compresses the tendon against bone.

Back of the heel higher up, with a bony bump

Just above the attachment sits a small fluid-filled sac, the retrocalcaneal bursa, which can become inflamed. Some people also have a ridge of bone at the back of the heel, called Haglund’s deformity, that rubs against a shoe. Look for swelling or a bump, pain that tracks with which shoes you wear, and relief in a backless shoe.

Pain on the sides of the heel that builds over weeks

A calcaneal stress fracture is a small crack in the heel bone from accumulated load, and it is serious and often missed. The pattern is distinctive: pain that builds over weeks after more walking, running or standing, pain when you squeeze the sides of the heel together, and pain that does not settle with rest, including at night. An X-ray taken early can look normal, because the crack is often not visible for weeks, so a normal result is not reassurance. Reduce the load and get assessed.

Burning, tingling or numbness in the heel

Burning, pins and needles, an electric quality or patchy numbness points to a nerve rather than a tissue, and nerve pain does not respond to fascia treatment.

Tarsal tunnel syndrome is compression of the tibial nerve in a narrow tunnel on the inside of the ankle. It causes burning in the heel and sole, often worse at night or after standing.

Baxter’s nerve entrapment involves a small nerve branch near the inside of the heel, the classic mimic of plantar fasciitis. The location is nearly the same, but the pain burns, may spread toward the outer heel, and will not improve with fascia treatment. Heel pain that has not responded to months of correct fascia treatment deserves a nerve assessment. Our page on nerve entrapment syndromes explains how these are treated.

When both heels hurt

Inflammatory forms of arthritis can cause pain where tendons and ligaments attach to bone. The clues differ from overuse: both heels rather than one, often a younger adult, sometimes stiffness in the lower back. If both heels hurt, particularly with morning stiffness lasting over an hour, raise it with your family doctor rather than treating it as overuse.

Why sudden heel pain without injury appears out of nowhere

When load rises faster than tissue recovers, the shortfall builds until the structure hurts. The pain arrives in a day, but the process took weeks. Common triggers:

• A job change to standing on hard floors
• A new exercise routine, or more steps a day
• New shoes, or worn-out shoes
• A house move, with lifting and stairs
• A holiday with a lot of walking
• A change in body weight

How heel pain is assessed

Examination does most of the work: where the tenderness sits, whether squeezing the sides of the heel hurts, and whether the symptoms feel nerve-like. Imaging is added when a stress fracture or tendon problem is suspected, and nerve studies when symptoms point to a nerve. If the pain is on the top of the foot instead, our top of foot pain guide covers that region.

What treatment usually involves

Load and footwear come first: easing the aggravating activity, cushioning where the fat pad or fascia is involved, and a shoe that spares the sore spot. Physiotherapy comes next, with loading matched to the structure, since the right exercise for one cause can aggravate another.

When pain persists, a pain clinic adds targeted options. Our physicians use ultrasound-guided injections placed into the structure actually involved. Where a nerve is the source, nerve blocks and treatment of the entrapment are considered. Platelet-rich plasma (PRP), made from your own blood, is an option in selected stubborn tendon cases. Which fits depends on the diagnosis.

Warning signs that need urgent care

Get seen promptly if any apply:

• Heel pain after a fall from a height
• A sudden pop at the back of the ankle, with no push-off
• A hot, swollen, red heel with fever
• Inability to put weight on the foot
• Numbness or weakness that is spreading
• Any foot wound or ulcer if you have diabetes
• Night pain that rest does not relieve

Frequently asked questions

Why does my heel hurt when I have not injured it?

Because most heel pain is a load problem rather than an injury. Tissue under and behind the heel adapts slowly, and when standing or training rises faster than it recovers, it becomes painful without a single moment of damage. Hard floors, new shoes and more steps all feed into it.

Can heel pain be something other than plantar fasciitis?

Yes, and often is. Fat pad thinning, Achilles irritation at its attachment, bursitis at the back of the heel, a heel bone stress fracture and nerve entrapment all cause heel pain. Location separates them, so note exactly where the tenderness sits.

How do I know if my heel pain is a stress fracture?

The pattern is pain building over weeks after more walking or standing, pain when you squeeze the sides of the heel, and pain that carries on at rest. An early X-ray can look normal, so it does not rule this out.

Why does the back of my heel hurt in certain shoes?

A firm heel counter presses on the Achilles attachment, an inflamed bursa, or a ridge of bone at the back of the heel. Pain that eases in a backless shoe points to that group, not the fascia. Swelling or a visible bump there makes it likelier.

This article is general information, not medical advice. It cannot diagnose your pain. If your symptoms are new, worsening, or worrying you, speak with your family doctor or contact us for an assessment.

Talk to a pain physician about your heel

If your heel pain has not settled with rest, footwear changes and physiotherapy, an assessment can identify which structure is involved. Our Toronto clinic has 13 pain physicians and imaging-guided treatment on site.

Most services are covered by OHIP with a physician referral, and you can also refer yourself directly without waiting for one.