Fingernail ridges can be caused by a variety of factors, including aging, injury, infection, illness, or medical conditions. The following are some of the most common causes of fingernail ridges:

• Aging: Vertical nail ridges may become more numerous or prominent with age due to changes in cell turnover within the nail.

• Nutrient deficiencies: Certain nutritional deficiencies, such as zinc or iron deficiency, can cause ridges in the nails.

• Medical conditions: Certain medical conditions, such as psoriasis, eczema, hypothyroidism, liver disease, and chronic kidney disease, can cause ridges in the nails.

• Nail trauma: Injury to the nails, picking at the nails, or exposure to strong chemicals can damage the nail matrix, affecting how the nails grow.

• Other diseases: Systemic amyloidosis is a rare disease that can affect the nails, and diseases that affect the joints, such as gout and rheumatoid arthritis, can cause problems with the nails.

If you have fingernail ridges, it is important to pay attention to other changes in your nails and seek medical attention if you experience other symptoms like texture changes in your nails. Your healthcare provider can help you determine why you have ridges in your nails and recommend appropriate treatment options based on the underlying cause.