The thickness of the endometrium varies with the menstrual cycle. Endometrium 7mm usually results in menstruation within 1-2 weeks, but it is also related to individual differences in the average thickness of a woman’s usual endometrium, her body’s hormone levels, and the presence of pathological changes. Usually endometrial lining of 7mm usually brings menstruation within 1-2 weeks, some women may also have menstruation at around 7mm due to thin endometrial lining. The thickness of the endometrium is also affected by the hormones in the body, and there are individual differences. Some women no longer have a thickened endometrium after 7mm, which may result in a prolonged delay in menstruation. After pregnancy is ruled out, ultrasound will be done to measure the thickness of endometrium, and progesterone drugs can be given to promote menstruation if it is greater than 10mm. If the thickness is less than 10mm, and there is still no menstruation after 2 weeks, we need to check female sex hormone 6 and thyroid function to rule out various endocrine diseases, including polycystic ovary syndrome, hyperprolactinemia, premature ovarian failure, hyperthyroidism, hypothyroidism, etc. These diseases will show delayed menstruation and have their own hormonal expression characteristics. For example, premature ovarian failure, which manifests as elevated blood follicle stimulating hormone with prolonged premature menopause, is treated with estrogen and progesterone supplementation cycle replacement therapy. Therefore, prompt consultation and definitive diagnosis with symptomatic treatment of the primary disease is needed to alleviate the onset of menstruation. Other diseases also need to be clearly judged according to the test results and then choose the appropriate treatment.