Many new mothers suddenly experience pain in the wrist during the menstrual period, at first they think it is accidentally twisted, but later the symptoms become more and more serious, the thumb is unable to exert force, the wrist is also swollen, even hold things, write these basic movements are difficult to complete. This is a kind of menstrual disease, commonly known as “mother’s hand”. This is a kind of tenosynovitis, mostly in the radial styloid process, also known as radial styloid stenosis tenosynovitis. Symptoms of “mother’s hand” include pain over the lateral aspect of the wrist, which may sometimes radiate to the proximal forearm or thumb; patients usually describe the pain as sometimes quite intense, especially when the thumb is actively or resistively straightened and extended. If tenosynovitis has developed, there will be localized pain and swelling. Common causes: During late pregnancy and postpartum, changes in hormone levels in the body can cause edema, laxity, and poor strength of the tendons and ligaments in the wrist, making them susceptible to strain and injury. During the menstrual period, because of the weakness of maternal blood and Qi, if attacked by wind and cold, the cold stays in the muscles and joints, it is easy to cause inflammation of tendons and nerves. After the birth of breastfeeding posture is not correct, often is a long time with the wrist to hold the baby’s head, thus straining the wrist tendons.