Ingrown toenails often happen because of poor nail care habits. Trimming your nails too short or filing them downward at the edges can encourage ingrown toenail development. Toenail injuries, including stubbing your toe, having someone step on your toe, or repetitive kicking during sports like soccer, can all cause an ingrown toenail.
Even the natural shape and size of your toenail may contribute to ingrown toenails. For example, if your toenails are quite large, but your nail bed is smaller, you have an increased risk of ingrown toenails.