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Published on: 8/20/2026

What causes an ingrown nail, and how can it be prevented?

Ingrown toenails are a common condition that typically develops when the edge of a nail grows into the surrounding skin, causing pain, redness, and swelling. The most frequent causes include cutting nails too short or rounding the edges, wearing tight or narrow shoes that compress the toes, and minor injuries such as stubbing your toe. To help prevent ingrown nails, trim your nails straight across (not curved), keep them at a moderate length, and choose well-fitting, comfortable footwear with enough room in the toe box.

If you're experiencing pain, swelling, or aren't sure whether your symptoms point to an ingrown nail or something else, guessing can delay proper care and make things worse. A fast, free symptom check can help you identify likely causes based on your specific symptoms and guide you toward the right next steps—whether that's simple home care or seeing a doctor. It takes just a few minutes and could save you unnecessary discomfort.

Reviewed for medical accuracy: 07/15/2026

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There are a few reasons why ingrown nails can occur. One main cause is the way nails are trimmed. When nails are cut too short or curved at the edges instead of straight across, they can grow into the skin.

Another cause is wearing shoes that are too tight. Tight shoes put pressure on your nails and toes, pushing the nail into the skin. Sometimes, a small injury or trauma to the nail can cause it to grow in a wayward manner, leading to an ingrown nail. Infections and other skin conditions may also play a role.

To help prevent ingrown nails, always trim your nails straight across rather than rounding the edges. This simple step can reduce the chance of the nail growing into the skin. It's also important to wear comfortable shoes that fit properly, giving your toes enough room to move without extra pressure. Keeping your feet clean and dry is also helpful.

Finally, if you notice any pain or early signs of an ingrown nail, you can use our free AI symptom checker to better understand your symptoms before deciding whether to address it with good nail care at home or schedule a visit to a doctor.

(References)

  • Cologne, Germany: Institute for Quality and Efficiency in Health Care (IQWiG); 2006-. Overview: Ingrown toenail. [Updated 2024 Jul 29].Available from: https://www.ncbi.nlm.nih.gov/books/NBK513138/

  • Mayeaux EJ Jr, Carter C, Murphy TE. Ingrown Toenail Management. Am Fam Physician. 2019 Aug 1;100(3):158-164. PMID: 31361106.

  • Chabchoub I, Litaiem N. Ingrown Toenails. [Updated 2022 Sep 18]. In: StatPearls [Internet].

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