A bunion is a bony bump that forms at the base of your big toe, where the toe meets the foot. It develops when the big toe gradually shifts toward the second toe, pushing the joint at its base outward. About 1 in 5 people worldwide have one, and they’re roughly twice as common in women as in men. Bunions aren’t just cosmetic. They can cause real pain and, over time, change the way your entire foot works.
What’s Actually Happening Inside the Joint
The medical name for a bunion is hallux valgus, and it involves more than just a bump growing on the side of your foot. Two bones are moving in opposite directions: the big toe drifts outward toward the smaller toes, while the long bone behind it (the first metatarsal) shifts inward toward the other foot. This creates that visible angle at the joint.
Once this shift begins, it tends to feed itself. The misalignment pulls tendons and the tissue surrounding the joint out of their normal positions, which weakens the inner side of the joint and reinforces the outward drift of the toe. The small bones that sit under the joint (called sesamoids) get displaced, and cartilage on the metatarsal head starts to wear down from abnormal pressure. This is why bunions are progressive: the structural changes that cause them also make them worse over time.
Causes and Risk Factors
The exact cause of bunions isn’t fully settled, but inherited foot structure plays the biggest role. If your parents or grandparents had bunions, your foot shape and mechanics likely make you more susceptible. Flat feet, loose ligaments, and the specific way your foot distributes weight during walking all contribute.
High heels and narrow-toed shoes are often blamed, but the relationship is more nuanced than most people think. Research suggests poorly fitting shoes probably don’t cause bunions on their own. Instead, they accelerate the process in people who are already predisposed. If your foot structure is vulnerable, years of cramming it into tight shoes will push the deformity along faster. Inflammatory conditions like rheumatoid arthritis, osteoarthritis, and flat feet also raise your risk.
Prevalence rises sharply with age. About 11% of people under 20 have bunions, compared to roughly 23% of those over 60. Women are affected at nearly double the rate of men, likely due to a combination of genetics and footwear patterns.
How Bunions Feel and Look
The most obvious sign is the bump itself, visible and often tender on the inner edge of your foot at the base of the big toe. But symptoms extend well beyond that bump:
- Pain or stiffness in the big toe joint, especially when walking or standing for long periods
- Swelling and redness around the joint
- Limited range of motion in the big toe, sometimes with a burning sensation when you try to bend it
- Difficulty with shoes, particularly anything narrow or with a heel
- Corns and calluses where the big toe rubs against the second toe
- Numbness in or around the big toe
Not all bunions hurt. Some people have a noticeable bump for years with minimal discomfort. Others experience pain early, particularly if their shoes put direct pressure on the joint. Pain that worsens in shoes but improves barefoot is a classic pattern.
How Bunions Are Diagnosed
A doctor can usually identify a bunion just by looking at your foot. X-rays confirm the diagnosis and measure severity using two key angles. The hallux valgus angle measures how far the big toe has drifted: under 15 degrees is normal, 16 to 25 degrees is mild, 26 to 35 degrees is moderate, and anything above 35 degrees is severe. A second measurement checks how far apart the first and second long bones of the foot have spread. These numbers help guide treatment decisions, especially when surgery is being considered.
What Happens If You Ignore Them
Left alone, bunions generally get worse. The pace varies, but the structural imbalance means the forces acting on the joint keep pushing it further out of alignment. Beyond increasing pain, untreated bunions can cause secondary problems. Hammertoes develop when smaller toes curl or bend abnormally to compensate for the shifting big toe. Metatarsalgia, a painful inflammation in the ball of the foot, occurs when your weight redistributes away from the dysfunctional big toe joint. Bursitis, inflammation of the fluid-filled cushioning sac near the joint, is another common complication.
Non-Surgical Treatment
Conservative treatment won’t reverse a bunion, but it can meaningfully reduce pain and slow progression. The foundation is footwear: wide toe-box shoes that give your toes room, with low heels. Spacers placed between the big toe and second toe can reduce friction and provide some relief.
Custom or over-the-counter orthotic inserts have good evidence behind them. In one study, patients using orthotic inserts saw their pain scores drop by more than half within 12 months, and the benefit held at 2 years. Orthotics work partly by redistributing pressure away from the bunion joint. Over 80% of patients in that study were still using them at 2 years, which suggests people find them helpful enough to stick with.
That said, orthotics manage symptoms rather than fix the underlying problem. A randomized trial comparing surgery, orthotics, and no treatment found that 83% of surgical patients reported pain improvement at one year, compared to 46% with orthotics and just 24% with no treatment. For mild to moderate bunions, though, conservative approaches are a reasonable first step.
Exercises That Help
Simple foot exercises can relieve stiffness and may slow progression by strengthening the muscles that support the toe joint. Toe points and curls (pointing your toes, then curling them, for 20 repetitions over 2 to 3 sets) work the muscles underneath your feet. Toe spread-outs, where you plant your heel and lift and fan your toes apart for 10 to 20 reps, help maintain mobility in the joint. Toe circles reduce stiffness by gently mobilizing the big toe through its range of motion.
These exercises are most useful early on, before significant joint damage has occurred. They won’t undo a bunion, but combined with proper footwear, they can keep the joint more flexible and less painful.
When Surgery Makes Sense
Surgery becomes an option when pain interferes with daily activities and conservative measures aren’t providing enough relief. Several procedures exist, and the choice depends on the severity of the deformity.
Osteotomy is the most common approach. The surgeon cuts and repositions the bone, then secures it with screws or pins to realign the joint. Minimally invasive versions of this procedure use smaller incisions and tend to involve faster recovery and less scarring. For severe bunions or cases involving arthritis, joint fusion (arthrodesis) removes the damaged joint surfaces and fuses the bones together. The Lapidus procedure addresses the problem further back in the foot, at the joint where the metatarsal meets the midfoot, and is often recommended for severe deformities or unstable joints, particularly in younger patients.
Recovery from bunion surgery typically involves several weeks of limited weight-bearing, followed by a gradual return to normal shoes over 2 to 3 months. Full recovery, including return to high-impact activities, can take 4 to 6 months depending on the procedure. Recurrence is possible, especially if the underlying foot mechanics that caused the bunion aren’t addressed.