Bunions are caused mostly by the foot structure you inherit — not by your shoes. What runs in families is the shape and mechanics of the foot: a first toe joint that is loose or angled in a way that lets the big toe drift over time. Tight, narrow, or high-heeled shoes can push that process along faster and make it hurt sooner, but in most people they are the accelerator, not the spark. That is why two people can wear the same shoes for decades and only one develops a bunion.
A bunion, known medically as hallux valgus, is the bony bump that forms at the base of the big toe when the toe leans toward its neighbors and the joint behind it pushes outward. It is one of the most common foot deformities we see in Northern Utah, and one of the most misunderstood. The idea that pointy shoes single-handedly create bunions is stubborn, and it leaves a lot of people blaming themselves for something their anatomy set in motion long ago.
So which is it — genes or shoes?
The honest answer is both, but not equally, and not in the way most people assume. Bunions are strongly heritable. If your mother or grandmother had one, your odds go up considerably, and they tend to appear on a similar timeline and in a similar shape. According to the U.S. National Library of Medicine's MedlinePlus Genetics resource, poorly fitting shoes probably do not cause bunions on their own, but they can make a bunion develop earlier or worsen faster in someone who already has an underlying susceptibility.
So the footwear-versus-genetics debate is a bit of a false choice. Genetics loads the gun; footwear, activity, and time can pull the trigger. Understanding that distinction matters, because it changes what you can realistically control and what you cannot.
What you actually inherit
You do not inherit a bunion the way you inherit eye color. What passes down is the underlying architecture of your foot — the traits that make a big toe joint prone to drifting. The most important ones include:
- A hypermobile or unstable first ray. The "first ray" is the big toe and the long bone behind it (the first metatarsal). When the joint at the base of that bone is looser than average, the metatarsal can splay away from the others, and the toe angles inward to compensate.
- Loose ligaments. People with naturally flexible, stretchy connective tissue tend to have joints that shift more easily under load, which includes the joints of the forefoot.
- Foot type and arch mechanics. Flat feet and the inward roll of the foot called overpronation change how force travels through the forefoot with every step, adding a sideways push on the big toe.
- Bone shape at the joint. The contour of the metatarsal head — the rounded end of the bone at the joint — influences how stable the toe is and how readily it can slip out of alignment.
These traits often travel together and often travel through families, which is why bunions can look like they are simply "passed down." What is passed down is the setup, and the bunion is what that setup produces over years of walking.
How a bunion actually forms
A bunion is not a growth or an extra piece of bone, and it is not a buildup of calcium from bad shoes. It is a joint slowly going out of alignment. Here is the sequence in plain terms. With each step, your big toe should push straight back through the ball of the foot. If the first metatarsal is unstable and drifts outward, the pull of the tendons and the pressure of walking gradually angle the big toe toward the second toe. As the toe leans in, the head of the metatarsal becomes more prominent on the inside edge of the foot — that is the bump you see and feel.
Once the alignment starts to shift, the forces that caused it tend to keep it moving in the same direction, which is why bunions usually progress rather than stay put. The pace varies enormously from person to person. Some bunions stay small and painless for life; others enlarge, stiffen, and start crowding the smaller toes, sometimes contributing to hammertoes or a painful bunionette on the outside of the foot. If you want a closer look at how we correct the deformity once it has formed, our overview of bunion removal and the Lapiplasty 3D correction walks through the surgical side in detail.
Where shoes fit in
Shoes deserve part of the story, just not the leading role most people give them. Narrow toe boxes squeeze the toes together and reinforce the inward lean of the big toe. High heels tip your weight forward onto the ball of the foot, multiplying the pressure on that joint. Worn day after day over years, footwear like this can absolutely speed up a bunion and make an existing one hurt more.
What shoes generally cannot do is create a bunion in a foot that was not predisposed to one. This is borne out by the pattern of who gets them: bunions occur in populations that rarely wear structured shoes at all, and plenty of lifelong high-heel wearers never develop one. The takeaway is practical rather than guilt-inducing. You cannot rewrite your genetics, but you can stop giving a susceptible foot extra reasons to progress by choosing shoes with a wide, deep toe box and a reasonable heel height.
Other things that raise your risk
Beyond inherited structure and footwear, several other factors influence who develops a bunion and how quickly:
- Sex. Bunions are far more common in women. A large systematic review in the Journal of Foot and Ankle Research pooled prevalence at roughly 30% in women versus 13% in men — more than double. A mix of footwear patterns, ligament laxity, and hormonal effects on connective tissue likely all play a part.
- Age. The same review estimated hallux valgus in about 23% of adults aged 18 to 65 and around 36% of people over 65. Bunions are progressive, so more years of walking means more time for a drifting joint to advance.
- Inflammatory arthritis. Rheumatoid arthritis and related conditions attack the joint linings of the forefoot and can drive bunion formation directly, independent of foot type.
- Pregnancy. Hormones that loosen ligaments for childbirth also loosen the joints of the foot, and the added weight raises forefoot load — which is why some women first notice a bunion during or after pregnancy.
- Prior injury or neuromuscular conditions. An old forefoot injury or a condition that affects muscle balance in the foot can tip the alignment in the same direction.
Can you prevent a bunion or slow it down?
You cannot prevent a bunion the way you might prevent a blister, because you cannot change the foot structure you were born with. What you can often do is slow the progression and delay the point at which it becomes painful — which is a meaningful goal. Sensible steps include:
- Wearing shoes with a wide, rounded toe box that lets the toes sit in their natural position, and keeping heel height modest for daily wear.
- Supporting the arch and controlling overpronation with good footwear or, when appropriate, custom orthotics — these do not straighten a bunion, but they can reduce the forces pushing it along and ease pressure on the joint.
- Keeping the muscles of the foot and calf strong and flexible, which helps the forefoot handle load more evenly.
- Paying attention early. A bunion that is caught while it is still small and flexible is easier to manage conservatively than one that has grown large and rigid.
It is worth being clear about what these measures can and cannot do. Splints, toe spacers, and orthotics can relieve symptoms and may slow things down, but no brace or exercise reverses a bunion or puts the bone back where it started — only surgery realigns the joint. If you are weighing what to do about a bunion you already have, our guide to bunion correction options lays out the conservative and surgical routes side by side, and our overview of what to know about bunion surgery covers the surgical decision in more depth than we cover here.
When to see a foot and ankle specialist
A bunion does not automatically need treatment. Many are painless and only need monitoring. It is worth having one evaluated if the bump is getting bigger, the big toe is crowding or overlapping its neighbors, the joint aches during normal activity, or you are struggling to find shoes that fit. Sudden redness, heat, and severe pain in the joint are a different matter and should be checked promptly, since they can signal an inflamed joint, gout, or infection rather than a simple bunion. Big-toe pain with stiffness rather than a sideways lean can point to arthritis of the joint instead, which is treated differently.
An in-person exam and a weight-bearing X-ray let us measure exactly how far the alignment has shifted and match a plan to your foot, your goals, and how much the bunion is affecting your day. If a bunion is slowing you down, you can request an appointment at either our Farmington or South Ogden office.
Medically reviewed by the board-certified physicians at Wasatch Foot & Ankle Institute — Dr. Jason Campbell, DPM, MHA, AACFAS, Dr. Colby Frost, DPM, MHA, FACFAS, Dr. Mark Woolley, DPM, FACFAS, Dr. Chantel Murrah, DPM, MHA, MPH, MBA, PhD. Our board-certified, fellowship-trained podiatrists provide foot and ankle care in Farmington and South Ogden, Utah. This article is for general education and is not a substitute for an in-person evaluation.
Photo by Angelo Pantazis on Unsplash