Low back pain when lying down is mainly due to a state of strain in the muscles, ligaments, tendons and other soft tissues of the lower back. These strained muscles are in a state of tension, which can lead to further aggravation of the strain. Therefore, for pain relief, the following measures are usually taken: 1. When lying down, soft pillows are placed under the knee joints bilaterally, which can help to reduce pain as the muscles and soft tissues of the lumbar region are in a relaxed state when the knee joints are flexed. 2. When lying on the side, soft pillows are placed between the knee joints bilaterally, and the knee joints are flexed bilaterally and the hip joints are flexed, which can effectively avoid the muscles, especially the lumbar 3, before going to bed, you can also sleep, warm water bag of hot compress, generally hot compress 20-30 minutes, after the lumbar blood circulation accelerated, the inflammatory metabolites get effective metabolism, will not appear to accumulate, will not stimulate the peripheral nerves around, there will be no pain. In addition, when sleeping at night, you must pay attention to keep warm and not get cold.