Cervical polyps do not affect menstruation because cervical polyps are just localized inflammatory changes in the cervix, resulting from chronic inflammation that causes localized hyperplasia and the formation of polyps. They do not affect the endocrine system, nor do they affect the endometrium, so they do not affect menstruation. However, cervical polyps may also cause bleeding problems, such as contact bleeding or irregular bleeding following an infection, but this is different from menstrual bleeding. Therefore, in cases of vaginal bleeding, routine examinations are necessary to check for bleeding on the cervical surface and to see if there are issues like cervical polyps, and to examine for conditions such as uterine inflammation, etc.