Bunions are a common foot deformity of the big toe.
They are often an inherited condition.
Footwear does not directly cause bunions but may contribute.
Bunions can occur in adolescence or develop as you get older. The deformity of a bunion tends to worsen over time.
Bunions can cause painful rubbing over the bony prominence in footwear. This makes finding footwear difficult and may limit activities. They can also be associated with pain elsewhere in the foot due to altered weight bearing caused by the big toe deformity.
You can try shoe modification with wider shoes to limit the rubbing. Splints and spacers may be helpful when worn to prevent rubbing. They will not correct the deformity permanently or prevent progression.