There are many reasons for nail streaks, which can be broadly categorized into physiological factors and disease factors. 1. Physiological factors: along with age, the nail stripes will gradually become obvious, if there are no other changes in the nails, generally do not need to deal with, this is a normal phenomenon. 2. Disease factors: (1) Gray nails: the nail plate can be cloudy, uneven surface, discoloration, there will be the appearance of patterns. (2) Nutritional deficiencies: Nail patterns may be caused by a lack of trace elements, vitamins, or certain skin diseases leading to nail malnutrition. There may be other reasons for the appearance of patterned nails, you should go to the hospital in time to clarify the cause of the disease, under the guidance of the doctor for treatment.