Sleeping under the waist pillow purpose is to maintain the normal physiological curvature of the lumbar spine, can avoid the waist overhang, help to play the role of support, to allow the muscles and surrounding soft tissues to fully relax, to avoid strain, strain and excessive tension. But because the height of the pillow pad is different for each person, there is no strict standard and after a long time pad, easy to the height of the pillow pad is not adapted, again aggravating the feeling of lumbar pain, so the method of pillow pad under the waist is not advisable. The best way is to flex the hips and knees and keep the waist straight and relaxed. You can put quilts or soft pillows on both knees and the back of the thighs when lying down to keep the hip and knee joints flexed, and the lumbar area will be able to achieve the purpose of relaxation. Pay attention to the warmth of the lumbar region at night, not to get cold, so as to effectively prevent the discomfort of the lumbar region.