Thickened toenails: What causes them?
Your toenails can thicken for many reasons. These include:
- A common skin condition that causes cells to build up rapidly on the surface of the skin (psoriasis)
- Tight-fitting shoes
- Fungal infections — as shown in this picture
Among these, a fungal nail infection — onychomycosis (on-ih-koh-my-KOH-sis) — is a common cause of thickened toenails.