Soreness in the left lumbar and hip area may be caused by physiological reasons such as long-term strain and cold stimulation, or by pathological reasons such as lumbar disc herniation and scoliosis. 1. Physiological reasons: often engaged in heavy physical labor or the body to maintain a fixed position for a long time, may lead to the left side of the waist, hip myofascial micro-injury and the emergence of localized fasciitis, which can cause the local blood circulation is not good, lactic acid, oxygen radicals and other metabolites accumulation, the emergence of soreness and pain symptoms. In addition, people who have been in the cold and humid environment for a long time may also suffer from the above symptoms. 2. Pathological causes: If the lumbar spine has degenerative lesions leading to lumbar disc herniation, it will lead to vertebral osteophytes, thickening or calcification of the ligamentum flavum, which will cause lumbar pain; further development will lead to compression of the spinal nerve roots or the spinal cord, which can be manifested as radiating to the buttocks and the lower limbs. Scoliosis caused by various reasons may lead to bilateral imbalance of muscle strength in the lower back and buttocks, and the above symptoms may also occur. If the symptoms are severe, or if they persist, the patient should seek medical attention.