Uterine fibroids are a type of benign lesion and generally grow slowly. Sometimes, even after several years of continuous re-examinations, the size of the uterine fibroids may not show significant changes. However, when uterine fibroids become malignant, their growth rate can accelerate, causing women to experience hidden pain in the lower abdomen. After the malignancy of uterine fibroids and an increase in size, they can also compress the pelvic floor nerves, leading to an intensification of abdominal pain; they can press forward against the bladder, causing frequent urination and urgency; and press backward against the rectum, resulting in changes in the characteristics of stools. Additionally, when some women's uterine fibroids turn malignant, they can also affect the surface area of the endometrium, impacting the menstrual cycle, such as causing irregular vaginal bleeding.