Calf soreness is a symptom that should be noted whether there are muscle strain, vascular disorder, trauma, lumbar spine disease and other triggering causes. 1. Muscle strain: when long-term strenuous exercise such as long-distance running, basketball, soccer, etc., resulting in calf muscles, tendons, etc. produce strain inflammation caused by soreness. 2. Vascular disorders: lower extremity deep vein vascular embolism, atherosclerosis, insufficient blood supply, varicose veins, phlebitis, etc., local blood circulation disorders in the calf can also cause calf swelling, pain, soreness and discomfort. 3. Trauma: fall, impact, etc. can cause calf muscle, tendon tears and other injuries, can also lead to calf swelling and pain. 4. Lumbar spine disease. Such as lumbar disc herniation, lumbar spine fracture, sciatic nerve injury, spinal stenosis, osteophytes, etc., nerve compression can also cause radiating pain in the calf. If the cause of calf pain is unclear and persists without relief, you should seek medical attention.