Pain in the left buttock and hip when waking up in the morning is a relatively common symptom in clinical practice. The main reasons may include the following aspects: First, it may be due to long-term pressure on the left buttock caused by the patient’s left lateral position during sleep, which will cause muscle soreness when waking up in the morning. Secondly, without excluding the manifestation of lumbar spine osteophytes and lumbar disc herniation, it is mainly due to the herniated lumbar disc that may compress the nerves on the left side, resulting in soreness and swelling pain mainly in the left hip when waking up. This condition generally indicates the early manifestation of lumbar disc herniation, or this painful symptom can occur due to osteoarthritis caused by unsatisfactory sleeping posture. Therefore, if you wake up with pain in the left hip area, it is best to go to a regular hospital for examination to find the exact cause of the problem and to carry out systematic treatment according to the cause.