The phenomenon of calf soreness after sex may be caused by physiological reasons, or may be caused by pathological reasons, such as calcium deficiency, phlebitis of the lower extremities, and so on. 1. Physiological reasons: if in the process of sexual life, the action is too violent, or too long, it is easy to increase the activity of the calf, improve the body’s lactic acid, which will easily lead to lactic acid waste metabolism is incomplete, in the calf accumulation and muscle stimulation, thus causing calf soreness. 2. Pathological causes: (1) Calcium deficiency: if there is a problem of calcium deficiency, due to the process of sexual life, the calf muscles have been in a state of fatigue and tightness, it is easy to cause the symptoms of spasmodic pain. (2) Phlebitis of the lower limbs: the patient himself has phlebitis of the lower limbs, and due to the excessive excitement of sex, the stimulation of the blood vessels produces spasm and reduces the speed of blood reflux, which is easy to trigger the symptoms of phlebitis, and there are symptoms of calf soreness and pain or tingling. If the symptoms persist, or occur frequently, it is recommended to go to the hospital in time to avoid delaying the condition.