Health Library

The Health Library is a collection of health and wellness resources created for learning and accessibility. Select a topic below for related health information or search for a topic in the search bar for more information on other medical conditions.

Missed or Irregular Periods

  • Many women experience abnormal vaginal bleeding or spotting between periods sometime in their lives. Vaginal bleeding is considered to be abnormal if it occurs: When you are not expecting your menstrual period. When your menstrual flow is lighter or heavier than what is normal for you. At a time in life when it is...

  • Birth control methods have high rates of effectiveness if they are used consistently. Follow your health professional's instructions on what to do if you miss or skip your birth control pills. Some general guidelines are listed here. Combination (estrogen plus progestin) birth control pills Always read...

  • It is not unusual for women who are taking hormone pills for birth control to have very light periods or no bleeding at all. If you have not missed any pills, skip 1 period, yet have no other signs of early pregnancy, it is very unlikely that you are pregnant. Signs of early pregnancy include fatigue, breast...

  • Most women have between 11 and 13 menstrual periods each year. You may be different: You may have more or fewer. Missed or irregular periods must be looked at in terms of what is normal for you. Menstrual periods are often irregular during the first...

  • If you participate in endurance sports, you may miss periods or stop menstruating. This is called secondary amenorrhea, and it occurs because your ovaries are not producing enough estrogen. It is believed that stress and low body fat contribute to amenorrhea. This is more likely to happen if you are younger and if your...

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