White lines on nails can be caused by several factors, including injury, exposure to toxins, and underlying health conditions. The appearance of the white lines can vary depending on the cause. For example, true leukonychia is a condition where white lines or dots appear on the nails and originate in the matrix of the nail, while apparent leukonychia is a problem with the nail bed under the nail and not the nail itself.
Some underlying health conditions that can cause white lines on nails include liver disease, anemia, kidney failure, and heavy metal poisoning. In some cases, white lines on nails can be a sign of decreased blood supply to the nail bed, which causes something known as Terrys nails.
Its important to note that not all white spots or lines on nails are a cause for concern. Many healthy adults will notice spots on their nails at some point, and they are often harmless. However, if you are concerned about the appearance of white lines on your nails, its best to consult a healthcare provider to determine the underlying cause and appropriate treatment, if necessary.
