Soreness in the calf tummy after foot sprain may be caused by calf tummy muscle strain, pain stimulation of the calf muscle causing spasm and other reasons. 1. Muscle strain: when improper exercise, external forces and other causes of foot sprain at the same time, may be due to the movement of more than the maximum range of skeletal muscle can withstand and muscle fiber tear or rupture, caused by the calf stomach (gastrocnemius muscle, flounder muscle, etc.) muscle strain, muscle pain, swelling, fatigue, aches and pains, and even subcutaneous ecchymosis, petechiae and activity restriction phenomenon. 2. Muscle spasm: foot sprain can appear after the affected area of severe pain, pain stimulation can cause calf stomach muscle spasm, spasmodic contraction, lactic acid and other acidic substances produced to stimulate the muscle, causing muscle pain, swelling and other symptoms. Therefore, after the foot sprain appeared calf stomach soreness and other symptoms. There are many other causes of calf stomach pain after foot sprain, it is recommended to consult a doctor in time to clarify the diagnosis, under the guidance of the doctor for targeted treatment.