Missed Period but Not Pregnancy

Many women have their menstrual periods once every month. That is because the normal menstrual cycle has an average length of 21 to 35 days, so women may expect to have 11-13 menstrual cycles in a year. These are just averages, and every woman may have different lengths of menstrual cycles. However, some women may become a little bit concerned when her expected menstrual period does not come on the approximate date or week they had anticipated. If it seems like the period has not come for about 40 days or longer, one may consider it a missed period (amenorrhea). For women who are married or sexually active, it may be the first sign of pregnancy and this could be verified by taking a home pregnancy test. However, women can also be not pregnant but no period. There are many possible reasons for a missed period but not a pregnancy and the most common ones are discussed here.

Causes of Missed Period but Not Pregnancy

A missed period or amenorrhea is usually caused by pregnancy. However, there are other causes of missed period not due to pregnancy.

Natural amenorrhea

A woman undergoes different natural stages in her life that may result in missed periods. 

Medications

Some medications can cause missed periods. The most common cause of missed periods due to medications is the use of contraceptives. Oral contraceptives or birth control pills like Yaz, Seasonale, or Lybrel can affect the regularity of a woman's period and lead to missed periods or irregular menstrual flow. These newer pills can cause women to have no menstrual periods for several months in a row, compared to traditional birth control pills, which allowed one to have menstrual flow. Other forms of contraceptives like the injections (ex. Depo-Provera) or implants (ex. Implanon) can also lead to amenorrhea or irregular periods.

Other drugs that can make you experience not pregnant but no period include antipsychotic drugs, antidepressants, corticosteroids and chemotherapeutic drugs.

Hormonal imbalance

Anatomical problems

Problems in the female internal sexual structures or anatomy may cause amenorrhea, and these include:

Lifestyle factors

Dealing with Missed Period

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