Liquid nitrogen freezing is a common physical treatment for warts, and the results are relatively good. Warts are benign skin lesions caused by human papilloma virus infection that can occur in various parts of the body and are contagious. For common warts or plantar warts on the hands and feet, liquid nitrogen freezing is a common treatment. The actual liquid nitrogen freezing treatment is the application of liquid nitrogen to produce the depth of low temperature, acting on the warts local tissue, can cause a series of changes, resulting in local tissue degeneration and necrosis, so as to achieve the purpose of treatment. Liquid nitrogen cryotherapy is characterized by simple operation and safer treatment, but it needs to be operated by a professional physician. If the warts are large, multiple treatments may be required.