Wearing sandals in summer and excessive sweating can be caused by high ambient temperatures, as well as by calcium deficiency or plant nerve dysfunction. In addition, fungal infections of the feet can also lead to excessive sweating. Because there is still a small amount of organic secretions in the sweat, it is easy to have slippery feet. When the ambient temperature is too high, the body cannot dissipate heat by conduction and other means, but takes away excess heat from the body through sweating, which is used to maintain normal body temperature. This cause of excessive sweating is a physiological change that can be improved by adjusting the room temperature. Calcium deficiency when the nerve excitability increased, or itself has a plant nerve dysfunction, appear sympathetic excitability active, can stimulate sweat glands to increase sweating, you can try calcium gluconate, glutathione and vitamin b1 and other drugs to treat. The fungal infection of the feet can stimulate the sweat glands to sweat more because of the toxins released by the pathogen.