If the uterus increases after pregnancy, the ligaments will be stretched, which will cause back pain and lower abdominal cramps. If you have lumbar spine disease before pregnancy, such as herniated disc, pregnancy will aggravate the symptoms of herniated disc, and the nucleus pulposus of the herniated disc will compress the nerve, and sciatica will also occur. If sciatica occurs during pregnancy, local massage and physiotherapy are the main treatments, and pain medication should not be used. Pay attention to keeping the lower abdomen warm, and put a soft pillow on the back of the back when resting, which can also relieve the compression symptoms. Pay attention to calcium supplementation in the middle and later stages of pregnancy to avoid bone pain caused by calcium deficiency.