What causes a toenail to split?

1. Trauma

Trauma to the toenail, such as stubbing it or dropping something heavy on it, can cause the nail to split.

2. Fungal infection

Fungal infections of the toenail, also known as onychomycosis, can cause the nail to become brittle and split.

3. Psoriasis

Psoriasis is a skin condition that can affect the nails, causing them to become thickened, discolored, and brittle, which can lead to splitting.

4. Eczema

Eczema is a skin condition that can cause the skin around the nails to become dry and cracked, which can put stress on the nails and cause them to split.

5. Diabetes

Diabetes can cause damage to the nerves and blood vessels in the feet, which can lead to poor circulation and brittle nails that are more likely to split.

6. Nutritional deficiencies

A deficiency of certain vitamins and minerals, such as biotin, iron, and calcium, can cause the nails to become weak and brittle, which can lead to splitting.

7. Certain medications

Some medications, such as chemotherapy drugs, can cause the nails to become brittle and split.

8. Aging

As people age, their nails become thinner and more brittle, which can make them more susceptible to splitting.