Uterine fibroids are different from endometriosis in terms of disease type, etiology, clinical manifestations, etc.; for example, symptoms of uterine fibroids are mostly asymptomatic, with abnormal menstrual flow, while endometriosis is characterized by progressive worsening of menstrual cramps, and infertility and painful sexual intercourse are also possible. 1. Disease type: Uterine fibroids are benign tumors formed by the proliferation of uterine smooth muscle tissue, while endometriosis is the ectopic growth of functional endometrial tissue into tissues outside the uterus. 2. Etiology: The etiology of these two diseases is not clear, but the occurrence of fibroids is mostly related to heredity and estrogen level; the occurrence of endometriosis is mostly related to the reverse flow of menstrual blood and medical implantation. 3. Clinical manifestations: patients with uterine fibroids often have increased menstrual flow, prolonged menstrual period, abdominal pain, lower abdominal distension and other discomforts, and if the fibroid is relatively large, it may compress the adjacent rectum and bladder and cause frequent urination and constipation, etc.; patients with endometriosis have progressively aggravated menstrual cramps as the main clinical manifestations, and some of them also have the combination of menstrual cramps, infertility, pain during sexual intercourse and other discomforts.