Hallux valgus is the medical term for a bunion, a progressive foot deformity where the big toe angles inward toward the smaller toes while the bone behind it drifts in the opposite direction. About 19% of people worldwide have the condition, making it one of the most common foot problems. It develops gradually as the structures supporting the base of the big toe weaken, allowing the joint to shift out of alignment and create that characteristic bony bump on the inside of the foot.
What Happens Inside the Foot
The deformity starts at the joint where the big toe meets the long bone of the foot (the first metatarsal). The first change is a loosening of the ligaments and soft tissue on the inner side of this joint. Once those structures stretch out, the metatarsal bone drifts inward toward the midline of the body while the big toe angles outward toward the second toe. The big toe also tends to rotate, which further destabilizes the joint.
As the metatarsal head shifts, it becomes more prominent on the inner edge of the foot. That’s the “bump” most people notice. It isn’t new bone growth in most cases. It’s the normal bone becoming exposed as the joint moves out of position. Over time, the two small bones that sit beneath this joint (called sesamoids) no longer line up correctly, which changes how forces are distributed across the forefoot when you walk.
Who Gets It and How Common It Is
Women are roughly twice as likely to develop hallux valgus as men, with a prevalence of about 24% compared to 11% in men. Age plays a significant role: around 11% of people under 20 have it, about 12% of adults between 20 and 60, and nearly 23% of people over 60. The condition tends to worsen over decades, which is partly why it becomes more prevalent in older adults.
Causes and Risk Factors
Genetics are a major driver. Hallux valgus runs in families because foot structure is inherited. The shape of the metatarsal head, the length of the metatarsal bone, the flexibility of the first ray (the column of bones leading to the big toe), and the tendency of the hindfoot to roll inward all influence whether someone develops the condition.
Footwear matters too, though perhaps less dramatically than many people assume. Research from the MOBILIZE Boston Study found that women who regularly wore high-heeled shoes between ages 20 and 64 had a 20% increased likelihood of developing hallux valgus compared to women who didn’t. Shoes with narrow, pointed toe boxes are a particular concern, as they push the big toe laterally over long periods. Population studies going back decades consistently show higher rates of hallux valgus in shoe-wearing populations compared to people who go barefoot.
Flat feet are another risk factor, especially for men. In one large study, men with flat feet were about twice as likely to have hallux valgus as those without. The connection likely has to do with how flat arches change the distribution of pressure across the forefoot during walking.
Symptoms Beyond the Bump
The visible bump is usually the first thing people notice, but the symptoms extend well beyond appearance. Pain and redness over the bump are common, especially when shoes press against it. Bursitis, an inflammation of the fluid-filled sac over the joint, is the most frequent complication. Many people also develop calluses or blisters where the shifted toes rub against each other or against shoes.
As the deformity progresses, secondary problems often develop. The big toe crowding against the second toe can push it upward into a hammertoe position. Metatarsalgia, a deep aching pain in the ball of the foot, occurs because the altered alignment shifts excess pressure onto the middle metatarsal heads. Some people experience joint stiffness that limits how far the big toe can bend, which affects the push-off phase of walking. In more advanced cases, irritated nerves near the joint can cause numbness or tingling along the inner side of the toe.
One of the most commonly reported frustrations is simply finding shoes that fit. The widened forefoot and prominent bump make many standard shoe styles painful or impossible to wear.
How Severity Is Measured
Doctors assess hallux valgus severity using X-rays to measure two key angles. The hallux valgus angle (HVA) measures how far the big toe deviates from its normal straight position. The intermetatarsal angle (IMA) measures the spread between the first and second metatarsal bones.
- Mild: HVA under 30 degrees, IMA under 13 degrees
- Moderate: HVA between 30 and 40 degrees, IMA between 13 and 20 degrees
- Severe: HVA over 40 degrees, IMA over 20 degrees
These measurements guide treatment decisions, particularly when surgery is being considered. A bunion that looks large isn’t necessarily severe by these criteria, and a modest-looking bump can sometimes have significant angular displacement.
Conservative Treatment Options
Non-surgical management focuses on reducing pain and slowing progression rather than correcting the deformity. The three most commonly used approaches are footwear changes, foot orthoses (custom or over-the-counter insoles), and targeted exercises.
Switching to shoes with a wide toe box is the single most practical change, since narrow footwear is both a risk factor and a pain trigger. Foot orthoses can help by redistributing pressure away from the big toe joint and midfoot. One clinical trial found they reduced pain at six months. Night splints, which hold the toe in a straighter position while you sleep, are also widely used, though evidence for their long-term effectiveness is limited.
Strengthening exercises show promise. A resistance exercise program targeting the muscles that flex the big toe downward improved strength by about 20% over 12 weeks in one trial involving older adults. Stronger toe muscles may help stabilize the joint and counteract some of the forces pulling it out of alignment. When footwear, orthoses, and exercises are used together, patients in pilot studies reported meaningful improvements in foot pain, though the combination hasn’t been tested in large trials yet.
No conservative treatment will reverse the bony deformity once it’s established. These approaches manage symptoms and may slow progression, but they won’t straighten the toe.
When Surgery Is Considered
Surgery becomes an option when pain significantly limits daily activities and conservative measures haven’t provided enough relief. The specific procedure depends on the severity of the deformity. For mild cases, a distal osteotomy (a cut and repositioning of the bone near the toe joint) is typical. Moderate deformities often require a cut higher up on the metatarsal bone, sometimes combined with a second cut near the toe. Severe cases may need a procedure that fuses the joint at the base of the first metatarsal, which addresses instability at the root of the problem and is particularly useful when the first ray is hypermobile.
What Recovery Looks Like
The first two weeks after any bunion surgery involve staying off your feet and resting. After that, the timeline depends on the procedure. With newer minimally invasive techniques, you may be able to bear weight within 24 hours using a special post-operative shoe. More involved procedures require two to four weeks of restricted weight-bearing before you can start walking on the foot.
Most people need at least two weeks off work, and longer if the job involves commuting or standing. You’ll wear a surgical shoe for roughly six weeks, after which most patients can transition to a normal sneaker. By three months, flat shoes, boots, and sneakers generally fit comfortably. Running and jumping are typically restricted for 12 weeks, though lower-impact activities like cycling, swimming, and walking can resume earlier as comfort allows. Open surgical approaches tend to have a longer timeline, with sneakers becoming comfortable around 10 to 12 weeks rather than six.