Is it normal for a 15-year-old not to have a period?

“Auntie” generally refers to female menstruation. 15 years old without menstruation is a normal phenomenon if it is due to physiological reasons, and can be observed for the time being. However, if there is a pathological reason for the lack of development of secondary sexual characteristics, the cause needs to be identified and actively treated.
Generally, the age of first menstruation is between 11 and 16 years old, but due to the influence of nutrition, body weight, heredity and other factors, some girls may be delayed until the age of 16, but there is the development of secondary sexual characteristics, such as breast eruption, pubic hair and armpit hair growth, etc., which is a normal phenomenon, and can be temporarily observed under the guidance of a doctor.
For those who do not have the development of secondary sexual characteristics and do not have menstruation at the age of 15, it is a pathological phenomenon, and physical examination, pelvic ultrasonography, CT or MRI, chromosome examination and hormone measurement are needed to clarify the cause.
If a girl does not have menstruation at the age of 15, it is recommended to go to the hospital, complete the relevant examinations, and under the guidance of the doctor to identify the causes, targeted treatment, so as to avoid delays in the condition.