The common clinical causes of calf muscle tightness are the following: First, the patient’s leg injury, resulting in a local fracture and accompanied by hematoma formation, will cause a significant increase in tension within the calf, manifesting as muscle tightness. At this time, the patient needs to improve CT or X-ray examination as soon as possible to clarify the severity of the fracture, and perform surgical internal fixation of the fracture as soon as possible to remove the intermuscular hematoma and avoid serious complications such as ventricular fascial syndrome due to the large local tension. Second, sudden occlusion of the arteries in the lower limbs causes a significant increase in intravascular tension, and a large amount of water leaks into the tissue interstices, causing tightness of the calf muscles, and the patient will have combined severe pain and decreased skin temperature. The specific site of embolism can be clarified through ultrasound examination, and interventional treatment to remove embolism or thrombolysis can be performed as soon as possible, and most patients can achieve better treatment results.