The question is too short to answer. We require information of your Age? last regular menstrual periods? Last menstrual period? How long you have the periods? Your child birth history? Other problems you have like Over wt, Acne, Hair on lips and chin? Your treatment history? Our answer here is put in general, trying to put the most common causes of Irregular periods and most common treatments adopted. The most common causes are Hormonal Imbalance, Thyroid, Fibroids, Alcoholism, Primary Amenorrhoea and Secondary Amenorrhoea, Post pregnancy, PCOD, Pituitary Axis Failure, Other Medical conditions. The common treatments are based on the cause which shall include Oral Contraceptive pills, Progesterone Supplements. Please come on to our live chat and speak to our doctor for a customised advice