The most common cause of left back pain after sleeping is generally an incorrect sleeping position or a bed that is too soft, resulting in inflammatory reactions in the local muscles and fascia, also known as myofasciitis, which can be relieved by local heat, physical therapy, massage, local irradiation with a TDP lamp, and topical creams. If the pain is really severe, the patient can take oral non-steroidal anti-inflammatory analgesic drugs to relieve the local pain. In addition to myofasciitis and other local myofascial soft tissue inflammation, it is also necessary to exclude the possibility of heart, abdominal, liver and gallbladder diseases that may cause pulling pain in the left posterior back.