Nail fungus is caused by fungal organisms, mainly dermatophytes, that thrive in warm, moist environments. The infection often begins when fungi enter through tiny cuts or cracks around the nail. Contributing factors include poor hygiene, sweaty feet, walking barefoot in public showers, wearing tight shoes, and having health conditions like diabetes or a weakened immune system. https://zanaquick.com/blogs/news/what-is-nail-fungus