The causes of abdominal pain caused by small fibroids in different parts of the uterus are as follows: 1) subplasma fibroids: red degeneration of fibroids can cause abdominal pain; 2) interstitial fibroids: contraction of the uterus can cause abdominal pain; 3) submucosal fibroids: when necrosis and detachment occur, a series of tissue materials can be discharged, stimulating contraction of the uterus and causing abdominal pain. Combined symptoms of uterine fibroids, such as red degeneration of fibroids and necrosis of submucosal fibroids, can be caused by infection or irregular lifestyle, and it is recommended that such patients improve their lifestyle habits appropriately.