Gray nails are caused by fungal infections, which include Trichophyton rubrum or Trichophyton epidermidis. The main symptom of a fungal infection is intense itching, which is difficult to relieve with hand scratching, and pain is less common. Most pain associated with fungal infections is often due to secondary bacterial infections, sometimes due to inflammatory irritation and irritation of peripheral nerves, but most pain is not too severe. For bacterial infections secondary to fungal infections, the bacterial infection must first be removed, and can be treated with oral anti-inflammatory medications and topical application of antiseptic creams. In addition, antifungal treatment must also be administered after the bacterial infection has been controlled in order to control the symptoms more effectively. Patients with gray nails should pay attention to a high protein diet, eating more oatmeal and soy products and the like, as well as more vegetables and fruits. Daily walking can be done by relaxing the feet properly, not wearing non-breathable shoes, and doing a good job of cleaning the feet.