Nails are a whole, no matter which finger. Nail depression is a symptom of nail diseases, indicating that the body lacks calcium, protein and sulfur. These nutrients can be obtained from eggs and garlic, so it is better to eat them often. Linearly raised nails, which look good, often appear after depression or illness. If you can eat a proper diet rich in protein every day and take vitamin C plus 15 mg zinc supplement, you can accelerate the growth of new nails and make the horizontal raised linear nails gradually disappear. Vertical sulcus nails sometimes appear after the age of 40, because the cell regeneration ability is weakened. Therefore, check at least once a year to see if there is anemia or lack of vitamins and minerals. The disease may indicate a lack of vitamin A, calcium or iron.