###Human: Why are my periods irregular? ###Assistant: Hi dear, I understand your concern .am also proud that kids of your age are so thoughtful to ask these questions.at your age I was not even aware of such things . first of all after menarche ,till 18 years of age your body will be adjusting to the changing harmones and also your HPO axis will mature till 18yrs of age ..hence irregular cycles are common during this period. but in your case your BMI is on higher side and obese for your height. As per your height your ideal weight should be 55kgs. weight reduction will help you best with your periods.as more estrogen is produced from body fat ,it leads to harmonal imbalance.also obesity causes insulin resistance and acne. also get evaluated for THYROID take tab.Yaz for 3 months to regulate your periods if you have any questions please feel free to ask if you are satisfied with my answer please leave a feedback