Calf back muscle pain, in general, the common causes are mainly the following possibilities: a. When the patient is hit by external forces, it can cause damage to the soft tissue of the calf back, and if accompanied by the formation of a local hematoma, the patient will experience significant pain. In this case, we need to improve the ultrasound examination to clarify the size and location of the hematoma, and perform debridement and drainage of the hematoma if necessary, so as to reduce the painful symptoms of the calf back muscles. Second, deep vein thrombosis of the lower limbs, which will cause obstruction of venous blood flow in the lower limbs, a large amount of blood and metabolic waste accumulation in the back of the calf, which can cause muscle pain symptoms. Patients can take oral rivaroxaban, subcutaneous injection of low-molecular heparin, intravenous application of hemosiderin and other drugs to promote the dissolution and absorption of venous thrombosis, thereby reducing the muscle pain in the back of the calf.