Thanks for the query.
There are many causes for missing the periods for a long time. You will have to consult a gynecologist for an examination and investigations like blood and urine tests and ultrasound as well. Pregnancy, hormonal imbalance, polycystic ovaries, thyroid dysfunction, anemia, nutritional deficiencies, obesity, stress related, side effects of medications can all be possible causes. The doctor will treat you accordingly after the investigations.
Hope this was helpful. Regards
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