Most of the post-partum pain in the waist and buttocks joint is caused by dense osteitis, which is common in women, especially after giving birth, women are easy to suffer from dense osteitis, which can be manifested as pain in the sacroiliac joints, with obvious percussion pain and a positive 4-word test in the examination, and obvious density increase and narrowing of the joint space in the sacroiliac joints in the sacroiliac X-rays and CT examinations. Narrowing, then the following treatments should be carried out: first, pay attention to diet, avoid eating too much sugar, avoid eating too much protein, too salty food, and at the same time, do not drink too much coffee, which can lead to osteoporosis and exacerbate the condition; second, early physiotherapy can be carried out, such as Chinese medicine, hot compresses, microwave physiotherapy, or acupuncture, tuina, which have a very good effect; third, early oral medication, if there is no breastfeeding, can be oral antidepressants, and can be taken as an oral medication. If you are not breastfeeding, you can take anti-inflammatory and pain-relieving drugs, such as meloxicam and celecoxib. If breastfeeding, physical therapy should be the main treatment, at the same time, usually pay attention to avoid cold, avoid long-term stooping to hold objects, avoid sedentary, avoid lumbar fatigue, which can also alleviate the pain at the sacroiliac joints.