White patches on nails may be caused by localized infection, trauma, nail malnutrition, or certain systemic diseases. 1. Local infection, trauma: when suffering from fungal infection, caused by gray nails, can be manifested as the appearance of white spots in the nails, i.e. cloudy wing-like white spots. In addition, mild nail trauma, nail plate structure is damaged, local white spots can also appear. 2. Nail dystrophy: when the growth area of nails is damaged or malnourished, the nails will show white patches, accompanied by deformation or unevenness. 3. Suffering from certain systemic diseases: immune diseases, blood diseases, endocrine diseases, etc., may lead to abnormal functioning of nail matrix cells, abnormal growth of the nail plate, which in turn leads to the appearance of white patches on the nails. The symptoms of white patches on the nails cause discomfort and timely hospitalization, and follow the doctor’s instructions to deal with.