“The causes of thickened toenails are as follows.
Toenails consist of the nail plate that covers the skin and the nail bed that is covered. A common factor that can cause a thickened toenail is a fungal infection.
When a fungus invades a toenail, it can easily become infected if the nail is in an environment that is conducive to fungal growth, such as confinement, humidity or high temperatures.
The fungus invades the surrounding skin and nail plate, affecting the growth of the toenail and promoting the build-up of keratinous material around it, which can lead to a thickening of the toenail.
If the damage is further aggravated, it can cause the nail plate to become brittle, break and then fall off.”