In terms of diagnosis, it can be complicated, especially in teenagers. A lot of medical professionals may not be familiar with what is considered to be a normal period or may be not familiar with what someone should be experiencing or not. So if you’re not sure of your concerns, please speak to your healthcare professional, get a second opinion if you’re not sure of the answers that your doctor provided, are providing for you. The first step is really a questionnaire, answering questions about what’s normal for your periods and what’s not normal for you. You may, in addition, have some blood tests to see about if you have anemia or not, a pap smear, depending on your age, an endometrial biopsy, and an ultrasound.