Left calf swelling and pain symptoms, the following common causes: first, left calf trauma, such as calf muscle strain or fracture, can lead to local bleeding, muscle subcutaneous tissue severe edema. The patient will have the clinical manifestation of swelling and pain, and in most cases cannot carry out prolonged weight bearing and activities. Second, the left lower limb venous return obstacle, such as varicose veins, will lead to the left calf venous stasis, tissue interstitial exudate increase. It will also cause symptoms of calf distension and pain, and the symptoms will be significantly relieved when pressed. Third, lumbar spinal stenosis and other lumbar diseases stimulate the nerves, which can cause distension and pain in the innervation area of the calf, most of which will be intermittent and will not be persistent. Patients will also have lumbar clinical manifestations, such as pain and activity limitation.