What causes cervical development?

Congenital developmental disorders, age of the patient is the main factor causing small cervical orifice. Under normal circumstances, the size of the cervix is 3 cm in diameter, the patient does not show cervical inflammation, young age, has not yet given birth through the vagina, the normal cervical orifice is small, and will present a circular needle shape. However, if there is dysmenorrhea, poor blood flow and other conditions, pay attention to find the cause, timely treatment.