The right buttock is a little sore when sleeping pressure may be caused by bad posture, may also be caused by lumbar intervertebral disc herniation, gluteal fasciitis and other factors. 1. Bad posture: long-term stooping or crossing the legs and other postures will lead to a shift in the center of gravity of the human body, causing fatigue damage to the buttock muscles and other soft tissues, so that the right buttock will be pressed and painful when sleeping. 2. Lumbar disc herniation: the nucleus pulposus protrudes to the side of the annulus fibrosus after the lumbar disc herniation, compressing the surrounding sciatic nerve root, making the innervated area feel abnormal and causing the symptoms of buttock pain. 3. Gluteal fasciitis: when the buttocks are cold or hit by external force, it will lead to aseptic inflammation such as edema and hyperplasia of the fascia of the buttocks, which will cause a bit of soreness in the buttocks. In order to clarify the cause of the disease, it is recommended to go to the hospital for examination and diagnosis as soon as possible.