Lying waist hanging may be physiological curvature, may also be suffering from lumbar disc herniation, lumbar spondylolisthesis and other diseases caused. 1. Physiological curvature: the human spine has a certain curvature, so lying down in the state of the waist may be in a suspended state, which is a normal phenomenon. This is a normal phenomenon. If there is no discomfort such as lumbar pain, there is no need for special treatment. 2. Lumbar disc herniation: Lumbar disc herniation is usually caused by degenerative changes in the lumbar discs, congenital abnormalities in the lumbosacral region, and long-term damage to the lumbar region. Patients may have symptoms such as lumbar suspension when lying down, lumbar pain, and limited lumbar movement. 3. Lumbar spondylolisthesis: congenital underdevelopment of lumbar vertebrae, trauma to the lumbar region and other reasons may induce lumbar spondylolisthesis, so that the patient’s lumbar vertebrae increase in anterior convexity and posterior convexity of the hips, and the lumbar depression symptom, leading to the patient’s lumbar suspension when lying down. After excluding physiological factors, patients lying with a suspended waist are recommended to go to the hospital for relevant examinations to determine the cause of the disease.