Girls 14 years old did not come to menstruation (menstruation) may be a normal phenomenon, may also be related to endocrine disorders and other factors. 1. Normal phenomenon: under normal circumstances, some girls may not have menstruation at the age of 14, due to normal physiological manifestations, only the first menstruation is late, without any other abnormal manifestations, without special treatment, with the gradual development and maturation of the reproductive system, may come to menstruation later. 2. Endocrine disorders: If you are too skinny or have an irregular diet, it may also lead to endocrine disorders and the absence of menstruation. During puberty girls must do a good job of daily care, try not to eat stimulating foods, do not drink and smoke, do not stay up all night, and ensure adequate sleep. If there is still no menstruation for a long time, and the development of other secondary sexual characteristics is more obvious, it is recommended to consult a doctor for the appropriate examination and follow the doctor’s instructions to deal with the treatment.