Thank you for your question. Irregularities in the menstrual cycle can have many different causes and it is important to speak with a doctor
. Obviously, one of the first things that your doctor will ask is about your sexual activity and whether or not you could be pregnant. He or she will quite possibly obtain a pregnancy test as well. He or she will also spend some time discussing safe sex habits. Then, he or she will discuss your overall health, including your weight and any chronic diseases. While not understood by everyone, weight can play a large role in the hormonal control of the menstrual cycle because of other changes to the hormones and the interactions between the fat cells and some of the hormones. Next, the doctor will likely determine if you have any intermittent conditions such as pelvic diseases or even sexually transmitted diseases (STDs). These can have many effects on sexual health, and even lead to problems with fertility in the future. Finally, he or she will ask about your family history, as some of these things can be genetic. Depending on the results of these conversations and potential tests, your doctor may have some ideas to explain the cause of your menstrual irregularities. Please speak with your doctor.