Nail longitudinal ridge is the appearance of the nail plate along the long axis of the nail depth, one or more line longitudinal stripes, may be physiological or pathological. 1. Physiological: Nutritional imbalance caused by partial feeding in young children, should be supplemented with vitamin A, iron and balanced diet. In old age, the number and depth of longitudinal nail lines gradually increase, which is a sign of aging and does not require special treatment. 2. Pathological: It is usually accompanied by symptoms such as decreased physical strength and easy fatigue, which indicates the presence of chronic inflammation in some tissues or organs of the body, such as decreased kidney function, pancreatitis, long-term inflammation of the small intestine, rheumatism and so on. If the young people appear nail longitudinal line, suggests that the respiratory system or the nervous system exists in a pathological state, should be based on the symptoms as soon as possible to the hospital consultation and treatment. When the longitudinal ridge of the nail is in the long-term mental tension, severe sleep deprivation and other overwork and overuse of the brain, it will be more obvious, should pay attention to rest and relaxation. If the longitudinal ridge of the nail does not exist in the above conditions, consider whether there is a history of trauma. Any minor damage may leave a mark on the nail, which will heal with time and does not require special treatment.