Cervical thickness of 25mm is generally normal. Cervical thickness mainly refers to the anterior and posterior diameters, and the normal length measured by ultrasound is about 2-3cm, which is usually related to age, menopause time, pubertal development, etc. Cervical thickness is only a reference indicator. Cervical thickness is only a reference indicator. Common indicators for determining cervical lesions are cervical smear, HPV test, and cervical exfoliative cytology, or TCT test. TCT and HPV can determine whether the cervix is cancerous, pre-cancerous, or inflamed, which is a more important indicator. Some women may have a shorter cervix due to surgery or other operations. Other special tests are needed to determine the exact length of the cervix and whether the cervical length is affected in the early stages of pregnancy, leading to the possibility of miscarriage or preterm labor. There is really no need to worry about the thickness of the cervix if there is no cervical examination or surgery or other operation. Usually, the cervix is only concerned with basic tests such as cancer screening, and ultrasound suggests that the cervix is 25mm thick, and other abnormalities need to be examined as well.