Ive noticed a lot of thin vertical lines on my nails, and theres always one or two thick, prominent vertical lines on every fingernail. Ive had tests done, including thyroid, X-ray, sugar, blood, and urine tests, and everything came back normal. Im wondering what could be causing this. Could it be related to something else? Please guide me on what to do next.

that could be due to mineral deficiency. consume foods that are rich in zinc like green leafy vegetables and fruits