The uterus can be enlarged for a variety of reasons, including physiological reasons such as pregnancy and consecutive deliveries, and pathological reasons such as uterine diseases such as adenomyosis and fibroids. If physiological conditions are ruled out after relevant tests, and there are long-term abnormalities such as menstrual disorders, irregular vaginal bleeding, dysmenorrhoea and frequent urination, you should be alerted to the possibility of disease and seek medical attention promptly.