causes of missed period not pregnant
Periods may also be irregular, with skipped periods, for the first few years after a woman has begun menstruating and in the perimenopause (the time period preceding menopause). A woman is not considered to have secondary amenorrhea until she has missed three menstrual periods in a row. However, the causes of secondary amenorrhea are generally the same factors or conditions that can lead to a skipped period. If a woman is not pregnant, a missed menstrual period may be due to a wide variety of both physical and emotional conditions that range from lifestyle stress to rare and serious diseases.