Fibroids in women are mainly hypoechoic nodules composed of smooth muscle and connective tissue of the uterus, while cysts are usually formed due to the local accumulation of fluid. Therefore, the difference between fibroids and cysts is firstly the difference in tissue formation, as fibroids are composed of substantial smooth muscle and connective tissue, while cysts are fluid collections, so cysts usually show up as liquid echogenic areas on ultrasound, while fibroids are usually hypoechoic nodules. Fibroids are often considered to be caused by estrogen and progesterone stimulation in the body, while cyst formation may be due to physiological luteal cysts that form on the ovaries after ovulation, or ordinary cysts caused by estrogen stimulation, or ovarian chocolate cysts that form due to endometriosis to the ovaries, so the causative factors for fibroids and cysts are different. Uterine fibroids usually do not have much adverse effect on women, unless the fibroids are large and may cause increased menstrual flow and prolonged menstrual periods, but cysts usually do not affect menstruation, whereas in the case of ovarian chocolate cysts, they may cause progressive dysmenorrhea, which does not change menstrual flow but causes significant pain, whereas fibroids rarely cause pain and discomfort in women. Fibroids rarely cause pain and discomfort. In addition, women can determine directly from the ultrasound whether it is a cyst or a fibroid.