The popliteal fossa is prone to sweating for the following reasons: first, the popliteal fossa is covered with sweat glands, the body needs to dissipate heat through sweat glands when the ambient temperature is too high, the process is the sweat glands secrete sweat, through the air flow can take away body heat and reduce the body surface temperature. Second, the popliteal fossa through the large blood vessels, including the popliteal artery, a large amount of blood through here into the calf, blood with heat, will be disseminated through the blood vessels, but also will prompt the sweat glands to secrete sweat for heat dissipation. Third, the popliteal fossa is often in a flexed state, the popliteal fossa heat dissipation is not good, heat is easy to gather, which leads to sweat glands secrete sweat, accelerating heat dissipation. In summary, the popliteal fossa easily sweat is a normal physiological phenomenon, is the body’s self-regulation of environmental temperature.