Normally, the uterus is in the pelvic cavity and cannot be felt or perceived to be hard. Usually, the physiological cause of uterine hardness is due to the performance of contractions after pregnancy; the pathological cause is due to the occurrence of tumors such as adenomyosis and uterine fibroids. I. Physiological reasons for launching contractions: As the uterus is relatively soft in texture, it can be felt only after the middle of pregnancy when the uterus grows out of the pelvis. Usually the hard touch is usually the performance of contractions, several times a day at the beginning, after that, as pregnancy progresses, contractions will gradually become more frequent, which is a normal physiological phenomenon. The regular painful contractions, also known as imminent labor, are characterized by pain once every five or six minutes, lasting more than ten seconds, and the contractions are getting tighter and tighter, and the pain is getting more and more severe, usually with a persistent hard uterus, even accompanied by vaginal bleeding. Second, pathological causes 1, adenomyosis: adenomyosis due to the invasion of endometrial glands and mesenchyme into the myometrium, resulting in a uniform increase in the size of the uterus, causing an increase in uterine hardness. Patients are advised to use medication or surgery; 2. Uterine fibroids: When patients have fibroids occurring, patients will show persistent uterine hardness. If the fibroids can be generally judged as uterine fibroids, it is recommended to perform further ultrasound examination to confirm the diagnosis. After diagnosis, if there are no symptoms, conservative treatment is possible; if symptoms appear, surgery is recommended.