18-year-old menstrual delay does not come what reason

18-year-old women do not delay menstruation reasons usually include endocrine disorders, reproductive system diseases, mental and psychological factors, excessive exercise, drug effects, etc. 1, endocrine disorders This is one of the common reasons. 18-year-old women may be due to study pressure, irregular schedule, excessive dieting and other factors leading to hormone imbalance in the body, and then affect the menstrual cycle, menstrual delay or even amenorrhea. 2, reproductive system diseases such as polycystic ovary syndrome. Polycystic ovary syndrome can cause ovulation disorders, leading to oligomenorrhea or amenorrhea. At the same time, it may be accompanied by hirsutism, acne, obesity and other performance.3, mental psychological factors in tension, anxiety, depression and other adverse emotions for a long time, will affect menstruation through the neuroendocrine system, leading to menstrual disorders. 4, excessive exercise If high-intensity sports or excessive weight loss, low body fat content, may affect the hypothalamic pituitary ovarian axis function, causing menstrual abnormalities. 5, drug effects Some drugs such as contraceptives, antidepressants, etc. may affect the menstrual cycle. In addition, environmental changes, malnutrition, etc. may also affect menstruation. If 18-year-old women delay menstruation for a long time, it is recommended to seek medical attention in time, conduct relevant examinations, such as ultrasound, sex hormone determination, etc., to clarify the cause, and under the guidance of a doctor for targeted treatment.