What is a uterine fibroid and how can it affect fertility? A fibroid (myoma) is a benign tumor of the myometrium - the muscular layer of the uterus. Certain fibroids grow toward the uterine cavity, deforming its shape. How can fibroids cause problems? 🔻 Abnormal uterine bleeding – distortion of the cavity can disrupt normal menstrual flow. 🔻 Infertility – fibroids can block the fallopian tubes, interfere with implantation, and cause chronic inflammation. 🔻 Abnormal myometrial contractility –