Sweating after calf soreness may be due to sweating blood vessel expansion and other physiological reasons, as well as lower extremity venous insufficiency and other pathological reasons. 1. Physiological reasons: when the temperature is relatively high, the local blood vessels will appear physiological expansion, blood circulation in the lower limbs is accelerated, more acidic metabolites such as lactic acid, oxygen free radicals, etc. are discharged, stimulating the peripheral nerve roots, the symptoms of soreness and swelling. At the same time, after the steam, no timely warmth, lower limb muscle spasm due to the principle of thermal expansion and contraction will occur, will also be manifested as acidic swelling. 2. Pathological reasons: mainly refers to the lower extremity venous insufficiency patients, such as phlebitis, varicose veins patients. When this kind of patients steam, the blood circulation is accelerated, the blood of the artery will accelerate the circulation into the superficial vein, and the blood of the superficial vein can’t flow back into the deep vein in time because of the bad function of the vein, resulting in most of the blood being stagnant in the superficial vein, which will result in soreness and swelling and even painful feeling. There may be other reasons for the soreness and swelling of calves after steaming, it is recommended to go to the hospital in time, improve the examination to clarify the cause of the disease, and then give targeted treatment or treatment under the guidance of the doctor.