Thank you for asking Healthcare majic. My name is Dr Ehsan Ullah & I have gone through your query. Missing period is something which we can Categorize into two groups A) Normally Missing periods... A women is said to be Normal even if she misses periods in Cases of 1. pre-puberty 2. Pregnancy 3. Post menupasal ... which is typical between the age of 45-50 years. B) Missing Periods Abnormally ... when there is some Pathology . It can be primary ; In case a girl never had period even after crossing the age where menses should start or It Can be secondary: as in your Case, in which a girl has started menses and then misses period typically for 6 months or Longer... You must miss at least three to six menstrual periods without pregnancy to be diagnosed with secondary amenorrhea (Amenorrhe means Missing periods ,whether normally or abnormally) It has many Factors the Key important factors are I. Emotional Stress II. Use of some drugs which lead to such condition III. Birth control Pills use IV. Hormonal imbalance in body V. Body weight ( Being over weight ) So You need not to worry as Sex is not the only Cause of missing periods. You should look at these factors , some life style changes modification like Avoiding Emotional stress Weight reduction Avoiding use of medications etc Can help you solve this issue If still , your problem of missing periods persists then you should not keep yourself worry, Just consult your physician preferably ObsGyn to sort of the Cause of this issue and get treatment accordingly Hope this may help you.Kindly write a review and Let me know if anything not clear. Thanks.