Bunions aren’t just a cosmetic bump on your foot. They’re a progressive bone deformity that, left unchecked, can cause chronic nerve pain, damage the cartilage inside your joint, deform your smaller toes, and significantly increase your risk of falls as you age. Roughly 19% of adults have bunions, with women affected about twice as often as men (24% versus 11%).
What Actually Happens Inside Your Foot
A bunion forms when the joint at the base of your big toe gradually shifts out of alignment. The long bone behind the toe (the first metatarsal) drifts inward toward your other foot, while the big toe angles outward toward your second toe. That bony bump you see on the side of your foot is the exposed head of this displaced bone.
Underneath the joint sit two small bones called sesamoids that normally act as pulleys for the tendons controlling your big toe. As the joint shifts, these sesamoids get displaced to the side, dragging the flexor and extensor tendons with them. Those displaced tendons then pull the big toe further out of alignment, creating a self-reinforcing cycle: the worse the bunion gets, the stronger the forces pulling it even further out of position. This is why bunions almost never correct themselves and tend to worsen over time.
Severity is measured by the angle of displacement. Under 20 degrees is considered mild, around 30 degrees moderate, and above 40 degrees severe.
Why Bunions Hurt More Than You’d Expect
The pain from a bunion isn’t just about a bump rubbing against your shoe, though that’s certainly part of it. As the bunion enlarges, it compresses and irritates the nerves running along the inside of your foot. Shoes that squeeze the forefoot make it worse, creating a double effect: the bunion narrows the space around the nerves from the inside while the shoe compresses from the outside. This can trap nerves and create chronic irritation that persists even after you take your shoes off.
The pain also spreads. When your big toe shifts inward, extra pressure transfers to your smaller toes. Over time, this imbalance irritates the nerves between the other bones in your forefoot, leading to inflammation and thickening of the nerve tissue. This thickened nerve tissue, called a neuroma, causes its own burning or shooting pain, typically between the third and fourth toes. So a bunion on your big toe can end up causing pain in a completely different part of your foot.
Damage to the Joint Itself
One of the most serious consequences of a bunion is what happens to the cartilage inside the joint. As the bones shift out of their natural position, the joint surfaces no longer line up properly. Cartilage that once distributed pressure evenly now bears load unevenly, and areas of high stress begin to thin and erode. The joint space narrows, and the bone edges develop bony spurs.
This is osteoarthritis, and once it sets in, it’s irreversible. The joint becomes stiffer and more painful, and eventually you may lose much of the range of motion in your big toe. Since your big toe joint handles a significant portion of your body weight during walking, especially during push-off, this stiffness can fundamentally change how you move. A bunion that starts as a cosmetic annoyance can, over years, become a joint that barely functions.
Problems That Spread to Other Toes
Your big toe doesn’t exist in isolation. As it drifts toward the second toe, it can push underneath or over the top of it, forcing the second toe upward into a bent position. This is a hammertoe, where the middle joint of the toe locks in a curled position, creating its own pressure points against shoes and its own pain. In some cases, the second toe crosses completely over the big toe.
The altered weight distribution also causes calluses and corns. When your big toe can’t do its job properly during walking, pressure shifts to the ball of your foot beneath the second and third toes. These areas weren’t designed to handle that much load repeatedly, so the skin thickens in response. The result is painful calluses on the bottom of your foot and corns on the tops of your curled toes, all secondary to a bunion that may seem like a separate problem.
Bunions and Fall Risk in Older Adults
For older adults, bunions carry a risk that goes well beyond foot pain. Your big toe plays a critical role in balance, helping you push off the ground and stabilize during walking. A bunion disrupts this function by altering plantar pressure, reducing stride length, and shifting your center of gravity.
The numbers are striking. Falls are significantly more common in older adults with bunions (58%) compared to those without (40%). Older adults with bunions have roughly twice the probability of suffering a fall. For women with bunions, the risk climbs even higher: about three times the fall risk compared to women without bunions. Given that falls are a leading cause of serious injury and loss of independence in older adults, a bunion is far from a trivial problem in this population.
Can You Stop a Bunion From Getting Worse?
No shoe insert, toe spacer, or splint can reverse a bunion. The structural displacement of bone is permanent without surgery. What conservative measures can do is slow progression and manage symptoms. Wide-toed shoes reduce pressure on the bump and the nerves around it. Padding and orthotics can redistribute weight across the forefoot. Ice and anti-inflammatory options help with flare-ups of pain and swelling.
Surgery is the only option that corrects the underlying bone alignment. In studies comparing surgery to no treatment, patients who had surgery rated their satisfaction at about 80 out of 100 at the one-year mark, compared to 61 for those who didn’t have surgery. Surgery also produced a meaningful reduction in pain and a slight improvement in function. That said, the evidence is based on limited studies, and surgery carries its own risks including recurrence, especially if the forces that caused the original bunion (like narrow footwear or inherited foot mechanics) remain.
The timing question matters. Earlier intervention, when the angle is still mild and the cartilage is intact, generally means a simpler procedure and a better outcome. Waiting until the joint has developed arthritis or the smaller toes have deformed limits what surgery can fully restore. If your bunion is progressing, the joint is stiffening, or the pain is changing how you walk, that’s the point where the consequences of inaction start compounding.