Foot odor is generally referred to as tinea pedis, and smelly feet may be caused by tinea pedis, or may be caused by the material of shoes and socks, or due to hyperhidrosis. 1. Smelly feet may be caused by tinea pedis, which is caused by fungal infection of the skin and is usually accompanied by symptoms such as skin peeling, blistering and itching. The process of fungal reproduction will destroy the keratin on the soles of the feet and produce some volatile gases, thus creating a distinct odor. 2. Foot odor may also be caused by the lack of breathability of the shoe and sock material. After sweating, the sweat mixes with the odor of the shoe and sock material, and foot odor will also appear. In addition, simple foot odor, also called stinky sweating, accompanied by excessive sweating of the feet, is caused by the decomposition of sweat and odor, and does not belong to the disease. If there is foot odor accompanied by itching and other conditions, it is recommended to consult a doctor in a timely manner to clarify the cause, under the guidance of a professional doctor for targeted treatment or therapy.