There are many reasons for the sour smell of feet, divided into physiological and pathological reasons, pathological reasons are foot diseases and infectious diseases. 1. Physiological: Normal healthy human beings may have sour feet if they wear impermeable shoes and socks or engage in strenuous exercise. This is because sweat infiltration and bacterial growth lead to sour feet, which is a normal physiological phenomenon, and can be restored by removing the causative factors, without additional treatment. 2. Pathological: If you suffer from foot diseases, such as sweat, this disease will cause the foot sweat gland secretion, thus appearing foot sour odor symptoms, may be related to hormone secretion, bacterial reproduction and other factors; and ringworm and other fungal infectious diseases can also cause the symptoms of sour feet, need to keep the local clean and dry, and comply with the doctor’s instructions to apply antifungal drug treatment. Excluding physiological factors caused by sour feet, you need to go to the hospital in time for professional diagnosis and treatment.