Bunions get worse when the big toe joint faces repeated or sustained pressure that pushes it further out of alignment. The main culprits are narrow shoes, excess body weight, prolonged standing, and underlying joint conditions. Some factors you can control, others you can’t, but understanding both helps you slow the progression.
Shoes That Squeeze the Forefoot
Footwear is the single most controllable factor in bunion progression. Shoes with a narrow, pointed toe box compress the toes together and push the big toe toward the second toe, reinforcing the exact deformity a bunion creates. High heels make things worse in two ways: they shift your body weight forward onto the ball of the foot, and they typically come with a tight toe box that leaves no room for the toes to spread naturally.
If you already have a bunion, wearing these shoes doesn’t just cause pain in the moment. The repeated pressure accelerates the structural shift of the joint over time. Switching to shoes with a wide toe box is consistently the first recommendation for relieving bunion pain and slowing progression. Zero-drop shoes, which have no raised heel and a wider forefoot, have become popular partly for this reason.
Standing and Walking for Long Hours
Jobs that keep you on your feet all day put continuous mechanical stress on the big toe joint. Research on nurses, one of the most studied groups for foot problems, consistently identifies bunions among the most common foot disorders in that profession. Factory workers, retail employees, and food service workers face similar risks. The combination of prolonged standing and walking long distances throughout a shift loads the forefoot repeatedly, and if your foot mechanics are already slightly off, that stress compounds over months and years.
The issue isn’t movement itself. It’s sustained, repetitive loading without adequate support or recovery. If your work keeps you standing on hard surfaces for eight or more hours, the cumulative pressure on an existing bunion can push it from a mild annoyance to a painful structural problem.
Body Weight and Foot Pressure
Higher body weight increases the mechanical load on your feet with every step. Research using genetic analysis methods has found a direct causal relationship between elevated BMI and bunion development, particularly in men. The logic is straightforward: more weight means more pressure on the first metatarsal bone, and that pressure can displace the joint further out of alignment over time. In severe cases, this weight-bearing displacement contributes not just to the bunion itself but to secondary problems like calluses under the ball of the foot and arthritis in the big toe joint.
Flatfoot also has a direct association with bunions, and carrying extra weight can worsen flat arches, creating a compounding effect.
Genetics and Loose Ligaments
Some people are structurally predisposed to bunions regardless of what shoes they wear. Genetics play a major role, primarily through inherited differences in ligament flexibility. People with naturally loose or stretchy ligaments, a trait called generalized ligament laxity, have feet that are less stable at the joints. This instability allows the first metatarsal bone to drift inward while the big toe angles outward.
A study published in Frontiers in Bioengineering and Biotechnology found that loose ligaments worsen bunions by impairing the foot’s ability to bear weight properly through the big toe. When the ligaments can’t hold the joint in place, the foot overpronates (rolls inward too much) during push-off, which weakens the muscles that normally stabilize the forefoot. This creates a cycle: the looser the ligaments, the more the joint shifts, and the more it shifts, the harder it is for surrounding structures to correct it. Ligament laxity affects up to 57% of people in some populations, and it’s more common in women, which partly explains why bunions affect women at roughly twice the rate of men.
Inflammatory Joint Conditions
Rheumatoid arthritis is a significant driver of bunion progression. Unlike the wear-and-tear arthritis most people think of, rheumatoid arthritis is a chronic inflammatory disease that attacks joint linings throughout the body. When it targets the forefoot, it weakens the ligaments and joint capsules that hold the toes in alignment. The American Academy of Orthopaedic Surgeons notes that bunions in people with rheumatoid arthritis tend to be severe, with the big toe commonly crossing over the second toe entirely. Orthopaedic treatment can relieve symptoms in these cases, but it won’t stop the underlying disease from progressing.
How Bunion Severity Is Measured
Doctors classify bunions by the angle of the big toe on an X-ray. A normal alignment is less than 15 degrees. Mild bunions measure 15 to 20 degrees, moderate ones fall between 21 and 39 degrees, and severe bunions reach 40 degrees or more. In one study of 301 X-rays, over half of all bunions fell in the moderate range, and nearly a quarter were severe. Knowing where yours falls on this scale matters because progression from mild to moderate is much easier to slow than progression from moderate to severe, where structural changes become harder to reverse without surgery.
What Happens When Bunions Progress
A worsening bunion doesn’t just mean a bigger bump. As the big toe angles further toward the second toe, it starts to crowd and press against the smaller toes. This pressure can cause hammertoe, a condition where the middle joint of a neighboring toe bends abnormally and gets stuck in that position. The normal mechanics of your foot also change: when the big toe can’t bear weight properly, the other metatarsal bones pick up the slack, leading to pain under the ball of the foot.
These secondary problems tend to develop gradually and are often what finally drives people to seek treatment, sometimes years after the bunion itself first appeared.
Can Orthotics or Toe Spacers Slow It Down
Toe spacers, the small silicone wedges you place between your big and second toes, have the best evidence for modestly correcting bunion angle. A systematic review with meta-analysis found that orthoses with a built-in toe separator reduced the bunion angle by roughly 2 to 6 degrees, and the effect held over time rather than being temporary. For people with moderate bunions, these devices also reduced pain without significant side effects.
Custom-molded foot orthotics, on the other hand, showed no meaningful effect on preventing bunion progression in a randomized controlled trial. They may help with overall foot comfort and arch support, but they don’t appear to change the angle of the big toe joint itself. If slowing the structural shift is your goal, a toe separator is a better bet than a full custom insole, though neither will reverse a bunion that’s already moderate or severe.
Age and Gender
Bunions become more common and tend to worsen with age. Global prevalence is about 11% in people under 20, rises to around 12% in adults aged 20 to 60, and jumps to nearly 23% in people over 60. Women are affected at roughly twice the rate of men, with a prevalence of about 24% compared to 11% in males. This gap is driven by a combination of hormonal differences that affect ligament flexibility, genetic predisposition, and decades of wearing shoes that compress the forefoot. Time itself works against bunions: ligaments naturally lose elasticity as you age, joints stiffen in their misaligned positions, and the cumulative effect of years of walking adds up.