Women with ovarian teratomas, when they are relatively small, usually do not affect the menstrual cycle. However, as they grow larger, they may compress the normal ovarian cortex, leading to abnormal ovulation, abnormal hormone secretion levels, disruption of the menstrual cycle, and can also cause difficulties in getting pregnant. Additionally, ovarian teratomas belong to germ cell tumors, which are multi-layered but can also develop into a single layer. Some teratomas are highly single-layered and can secrete certain hormones that affect women's endocrine system, thereby affecting the menstrual cycle.