Hello, There are several reasons of irregular period like hormonal imbalance, mental stress, ovarian cyst or PCOD, thyroid disturbances, wt gain or extreme loss, irregular eating habits, pelvic infection etc. Low hemoglobin is also an important cause. Do one pelvic USG scan and hormone test to rule out underlying causes. Kindly, consult with with your doctor for proper guidance. Key treatment: balanced diet wit protein & iron supplements, hormonal medication, avoid stress by regular meditation and control body weight.