Nails can split due to a variety of reasons, including physical stress, nutrient deficiency, wear and tear, and underlying health conditions. Some common causes of nail splitting include:

• Injury: A split nail can be caused by physical trauma, such as a stubbed toe or receiving a severe blow to a finger or thumb.

• Moisture: Overexposure to moisture, such as from doing dishes, washing hands frequently, or repeated nail polish use, can cause nails to become weak and brittle, making them easier to break, bend, or split.

• Nutrient deficiency: A lack of certain vitamins and minerals, such as biotin, iron, and zinc, can cause nails to become brittle and prone to splitting.

• Underlying health conditions: Certain health conditions, such as psoriasis, thyroid disease, kidney disease, and skin cancers, can cause nails to split more easily.

To prevent nail splitting, it is recommended to maintain good nail hygiene, avoid overexposure to moisture, and eat a balanced diet rich in vitamins and minerals. If you are experiencing frequent nail splitting, it is best to consult a healthcare provider to determine if there is an underlying health condition that needs to be addressed.