Menu Healthy Lifestyle Diseases & Conditions First Aid Symptoms Tests & Procedures Videos Definitions FAQs AmenorrheaUpdated: 2018-05-25When to make a doctor's appointmentSee a doctor if: Three or more menstrual periods are missed Aged 15 or older and never had a menstrual period © 1998-2019 Mayo Foundation for Medical Education and Research(MFMER). All rights reserved. Terms of Use