Why do fingernails become wavy?

Fingernails can become wavy due to various factors, including nutritional deficiencies, such as a lack of protein or vitamins, and underlying health conditions like psoriasis or eczema. Age can also play a role, as nails may naturally develop ridges and waves over time. Additionally, trauma to the nail matrix during growth can lead to irregular nail shapes. If the changes are significant or accompanied by other symptoms, it's advisable to consult a healthcare professional for evaluation.