Foot disease has two understood meanings, as follows: 1. Nutritionally, a disease caused by the lack of vitamin B1, also known as thiamine. It is mainly manifested as corresponding symptoms of the nervous system and circulatory system, such as indifference, mental trance, slow reaction, and even limb sensory disorders and motor disorders, and a disease with the nervous system as the main manifestation is called pediculosis. Deficiency of vitamin B1 is also prone to changes in the heart system, such as enlargement of the heart, bruising, and reduction of the amount of return blood, while panic, shortness of breath, and even symptoms of the nervous system and circulatory system at the same time, thus affecting the health of the body; 2. In addition, a certain kind of foot disease is not due to vitamin B1 deficiency, but to the occurrence of infectious diseases caused by fungal infection resulting in skin erosion and ulceration of the feet.