Morton's Neuroma: The Pebble Under the Foot and What Fixes It
You stop on the sidewalk, pull the shoe off, and shake it out. Nothing falls out. Ten minutes later the pebble is back under the ball of the foot, a little toward the outside, with a burn that runs into two toes. Shoe off, a rub of the forefoot, and it eases. Shoe on, and it returns.
That pattern is Morton's neuroma, and the mechanism matters because every fix follows from it. A nerve that runs between two of the long bones in the forefoot has been squeezed long enough to thicken, and a thicker nerve gets squeezed harder. Everything that helps, from a wider shoe to surgery, is a way of giving that nerve room.
What a neuroma is
The nerves that give feeling to the toes run along the sole and split in the forefoot, one branch per web space, each passing under a ligament that ties the neighboring metatarsal heads together. Bone on either side, ligament above, ground below: the nerve has little room, and the gap between the third and fourth metatarsals is the tightest, which is why most neuromas sit there. The second web space is the other common site.
It isn't a tumor. Despite the name, it's a thickening of the tissue around the nerve, a scar-like response to years of compression. A nerve pinched often enough swells; swollen, it fits worse and gets pinched more. That loop is the whole condition.
Why it shows up after 40. Women get neuromas far more often, mostly through heels. Men arrive later, and the forefoot spreads with age as ligaments loosen and the arch settles, so a foot that fit a D width at 30 is often closer to an E at 50, still going into the same D shoes. A narrow toe box pushes the metatarsal heads together and the nerve takes the squeeze. Any heel, including the inch on a dress shoe or a work boot, tilts weight onto the forefoot and holds the toes bent up, which stretches the nerve over the ligament. Running and court sports load the same spot on every push-off.
What it feels like
The pebble. A marble, a pebble, or a sock bunched under the ball of the foot, usually toward the outer half. Nothing to see: no lump, no redness, no swelling.
Burning or numbness into two toes. The nerve serves the facing sides of two neighboring toes, so the burn, tingling, or numbness runs into the third and fourth toes (or the second and third), not the whole foot.
Relief from taking the shoe off. Shoe off, forefoot rubbed, and it eases within minutes. Early on it shows up only in certain shoes or after a long day; over months it arrives sooner and lingers longer.
Is it a neuroma, or something else?
Four things hurt in the ball of the foot, and each behaves differently.
Metatarsalgia. A diffuse ache or burn across the ball, worse at the end of a standing day, better with rest, no numb toes, often both feet: a thinning fat pad plus a shoe that loads a small area. The ball-of-foot pain guide covers it.
A plantar plate tear. Pain right under one toe joint, usually the second, sharpest at push-off. Over months the toe lifts or drifts and the top of the joint swells.
A stress fracture. Deep pain at one spot on the shaft of a metatarsal, worse the more you do. The top of the foot swells, the bone is tender to a fingertip, and it usually follows a jump in mileage. Needs imaging, not a shoe change.
Diffuse and dull is metatarsalgia; burning into two toes with a pebble is a neuroma; a tender spot on a bone or a joint is a fracture or a plate injury until proven otherwise.
How it's diagnosed
Mostly by exam. The clinician presses on each web space and squeezes the forefoot side to side: the thickened nerve can pop between the bones with a click you both feel, and the squeeze reproduces the pain. An X-ray doesn't show a nerve but rules out a fracture and arthritis. Ultrasound is the preferred imaging when it's needed and can guide an injection; MRI is rarely required. Go in with notes on which shoes, which toes, and what helps; the doctor-prep checklist covers the rest.
What helps, in order
The toe box. Wide at the ball, not just labeled wide. Pull the insole out of your everyday shoe and stand on it; if the ball of your foot spills over the edge, that shoe is part of the problem. The replacement needs a low heel, a forefoot that bends where your toes bend, and width enough for the metatarsal heads to spread. What your dress shoes are doing to your feet covers wider fits that still pass in an office.
A metatarsal pad, behind the heads. A small domed pad that sticks to the insole and lifts the metatarsals just behind the ball, which slackens the ligament and opens the space the nerve sits in. Stand barefoot on the insole and feel for the ridge of bone at the ball. The pad's thick edge goes just behind that ridge, toward the heel, roughly a centimeter back, so the ball of the foot sits in front of the pad, not on it. Walk twenty minutes. A lump under the ball means too far forward; nothing at all means too far back. A pad under the heads makes a neuroma worse.
Looser lacing over the forefoot. Skip the bottom eyelet or two and tighten from the midfoot up. A lace pulled tight over the ball does the same job as a narrow toe box.
No narrow dress shoe on long days. Keep the pointed shoe to the hours it's required and change out for the rest.
A short rest from the sport that flares it. Two to four weeks off running, jumping, or court sports lets the nerve settle while the shoe changes take hold. The runners over 40 guide covers the return.
Time, but not unlimited time. With the shoe and pad in place, improvement usually shows within a few weeks, and surgeons generally give conservative care three to six months. If two weeks of self-care changes nothing, get examined to confirm you're treating the right thing.
Injections and surgery
Steroid injection. A corticosteroid with local anesthetic into the web space, often under ultrasound. In a patient-blinded randomized trial the steroid beat anesthetic alone at one and three months, and relief often runs for several months. Repeats are limited to a few a year, because steroid thins the fat pad and the skin over it. The 2024 Cochrane review rated the evidence for most neuroma treatments low-certainty; the steroid injection is the best-supported short-term option.
Alcohol sclerosing injections. A series of dilute alcohol injections meant to deaden the nerve. A five-year follow-up of one cohort found only about three in ten still symptom-free and roughly a third gone on to surgery.
Surgery. Considered after three to six months of conservative care that hasn't worked. A release cuts the ligament over the nerve and keeps sensation, with slightly less predictable relief. A neurectomy removes the thickened segment: it relieves pain for most men, and the trade is permanent numbness in the web space and along the facing sides of the two toes, plus a small chance of a painful stump neuroma where the nerve was cut. Recovery is a stiff post-op shoe for a few weeks and normal shoes at about four. Published long-term success runs around 80 to 95 percent.
What to do this week
- Stand on your insole. If the ball of your foot spills over it, replace that shoe with a wider, lower one.
- Fit a metatarsal pad in one shoe. Behind the ball, not under it. Test walk, adjust, then copy to the others.
- Re-lace. Bottom eyelets loose, tension from the midfoot up.
- Retire the narrowest shoe from long days. Carry the alternative.
- Cut the flaring sport for two weeks. Bike or pool instead.
- Write the pattern down. Which shoes, which toes, how long, what eases it.
When it's not a wait-and-see
Same-week appointment, not a routine one, if any of these apply:
- Numbness or tingling spreading beyond two toes to the whole foot, or in both feet. That points further up the leg; the numbness and tingling guide covers the causes.
- Pain that wakes you at night or hurts with the foot up.
- You have diabetes and any new forefoot pain, numbness, or burning.
- Swelling on top of the foot with a spot on the bone that's tender to press, especially after a jump in mileage.
- Redness, heat, or a fever with any foot pain.
Bottom line
A Morton's neuroma is a nerve squeezed between two metatarsal heads long enough to thicken, and the fix is room: a shoe wide at the ball with a low heel, a metatarsal pad behind the heads rather than under them, looser lacing, and a break from the sport that flares it. A steroid injection buys months when that isn't enough, and surgery works for most men who reach it, with permanent numbness between two toes as the price. The forefoot that spreads after 40 put you here; why your feet hurt after 40 covers the rest.
