The uterus is the organ that produces menstruation and nurtures the fetus. It is located in the center of the small pelvis, between the pubic bone and the sciatic spine, behind the bladder and in front of the rectum, and is part of the female reproductive system. The uterus weighs about 50 g, has a volume of about 5 ml, a thickness of about 2 cm, a width of about 4 cm, and a length of 7-8 cm. If at the end of pregnancy, the volume of the uterus can reach 5,000 ml, and the uterine muscles are smooth muscles that can be extremely extended. The uterus and the rectum form a rectal uterine sink, and the bladder in front of it forms a bladder uterine sink, which is often the frequent site of fluid or pus accumulation. The uterus provides 50%-70% of the blood supply to the ovaries bilaterally to maintain ovarian function. The uterus also secretes many hormones, such as lactogen, insulin growth factor, epithelial growth factor, and endothelin, which are involved in the endocrine function of women. In addition, the uterus, as a link in the systemic immune function, can play a role in resisting stimulation by external factors, as well as protecting the ovaries and avoiding infection. However, early and chaotic sexual life, frequent menstrual and maternal intercourse can affect the uterus and lead to more serious diseases such as cervical cancer. Therefore, it is recommended that women should pay attention to hygiene and cleanliness and abstain from sex in order to care for the uterus.