Absent menstruation, or amenorrhea, is the absence of menstrual bleeding. It happens when a girl hasn’t had her first menstrual period by age 16. It also occurs then a woman fails to menstruate for 3 to 6 months.

Absent menstruation may occur for a variety of reasons. The most common of these include natural causes, lifestyle factors, and hormonal imbalances.

Amenorrhea can happen for many reasons. The most common cause is pregnancy. However, amenorrhea may also be caused by various lifestyle factors, including body weight and exercise levels.

In some cases, hormonal imbalances or problems with the reproductive organs might be the cause.

It’s important to see a doctor about absent menstruation, as the underlying cause may require treatment. Absent menstruation often resolves once the cause is treated.

Causes of absent menstruation
Primary and secondary amenorrhea can occur for numerous reasons. Some causes are natural, while others are medical conditions that need to be treated.

1. Natural causes most likely to cause amenorrhea include pregnancy, breast-feeding, and menopause.
2. Lifestyle factors may include excessive exercise and stress. Also, having too little body fat or too much body fat may also delay or stop menstruation.
3. Hormonal imbalances may cause amenorrhea. They are usually triggered by tumors on the pituitary gland or the thyroid gland. Low estrogen levels or high testosterone levels can also cause them.
4. Genetic disorders or chromosomal disorders, such as Turner syndrome and Sawyer syndrome, can sometimes cause late menstruation.
5. Medications can cause amenorrhea in some women.
6. Antipsychotics and antidepressants are often involved.
7. Chemotherapy drugs and medications that treat high blood pressure can cause problems with menstruation as well.
8. Suddenly stopping birth control pills may also lead to several months of absent periods before the cycle returns to normal.
9. Physical defects such as structural problems in the female reproductive organs might be responsible for absent or delayed menstruation.
10. These issues can result from birth defects, tumors, or infections that occurred in the womb or shortly after birth.
11. In rare cases, missed periods could be a symptom of Asherman’s syndrome. This occurs due to scarring in the uterus after surgery, which can prevent menstruation.