The pain in the buttocks after waking up may be caused by the following reasons: 1. It is caused by long-term excessive pressure on the buttocks, which is often seen when the bed the patient sleeps in is too hard or when there is a hard foreign body under the buttocks during sleep, which may squeeze the buttocks muscles for a long time and produce sterile inflammation, followed by pain in the buttocks after waking up. 2. It may be caused by trauma to the buttocks, such as when the patient has a mild muscle strain in the buttocks before sleep, which may feel more serious after waking up. 3.It may be caused by excessive fatigue, for example, the patient did excessive labor or exercise before sleep, resulting in a large amount of lactic acid deposition in the hip muscles. This may cause hip pain after waking up due to lactic acid stimulation.4. It may also be caused by cold, for example, if the patient’s hip touches a cold object during sleep, it may cause muscle spasm and lead to hip pain after waking up.5. It is caused by poor sleeping posture, that is, the patient’s hip is affected by poor sleeping posture during sleep, which leads to muscle spasm and then produces pain. pain.