The size of the uterus in a normal adult non-pregnant person is 7-8cm in length, 4-5cm in width, and 2-3cm in thickness, with a capacity of about 5ml. The size of the uterus cannot be generalized, and the uterus enlarges significantly when the pregnancy is in full term. The uterus is one of the unique internal reproductive organs of women, which mainly produces menstruation and nurtures the embryo and fetus. According to the relevant authoritative data, under normal circumstances, the size of the uterus in an adult without pregnancy is about 7-8cm in length, 4-5cm in width, 2-3cm in thickness, 5ml in volume and 50-70g in weight. However, the size of the uterus cannot be generalized, and there is obvious individual variability, mainly related to ageing, heredity, pregnancy and other factors. For example, when a woman is in her first trimester of pregnancy, the uterus will increase in size to 35cm x 25cm x 22cm, with a capacity of about 5000 ml, and a weight of about 1000g. If the uterus is found to be abnormal in size, further relevant examinations should be conducted to clarify the specific cause.