This is a normal phenomenon during pregnancy. During pregnancy, especially in the later stages, you should start supplementing with calcium, taking one calcium tablet a day. Reason two: During pregnancy, pregnant women are affected by changes in hormonal secretion, and their spine and pelvis The ligaments of joints such as bones become loose. If pregnant women do not sit or stand correctly, it is easy to aggravate the discomfort of the waist. Pregnant women can pay attention to maintaining the normal curvature of the waist to avoid increasing the tension on the spine, which will help relieve the pain of the waist. Discomfort. 1. Maintain an upright posture when standing and maintain the normal curvature of the spine. Do not push the abdomen upward excessively and bend the upper body backward for balance to avoid increasing the pressure on the spine. 2. Maintain the waist when sitting. If you are upright, you can put a soft cushion on the back of the chair to support the curvature of the spine and help relieve pain. Do not relax your body on the back of the chair. Excessive bending of the waist will cause back fatigue. 3. Lie on your back and put a pillow under the knees to relax the back. Placing the mattress flat can help reduce the tension on the waist bones. Sleeping on the side can help reduce the pressure on the abdomen, so pregnant women will sleep more comfortably. In addition, placing a pillow between the legs with slightly bent knees can help reduce the tension on the waist bones. Pregnant women Tips for choosing a mattress: 2 inches thick, hard, avoid: too thick, too soft. Note: 1. The hardness of the mattress, press it on the mattress with your hands, the depression range is only in the pressurized position. 2. If the bed you are using When the mattress is too old and some of the springs have lost their elasticity, it should be replaced with a new one.