The most common causes of calf muscle soreness without exercise are twofold: 1, it may be caused by calf muscle strain, this situation is most common is often standing at work, or often walking more people, generally appear this situation is due to frequent force and strain on the calf muscles, resulting in muscle soreness at night. 2, it may be lumbar spine disease, compression of nerve roots and The most common cause of nerve pulling pain in the calf, or muscle pain, is lumbar disc protrusion or lumbar spinal stenosis. If it is a lumbar disc herniation, it usually compresses the nerve root on one side and causes muscle pain on one side of the calf, if it is a lumbar spinal stenosis, it usually compresses the nerve root on both sides and causes bilateral calf pain.