Snapshot A 17-year-old girl presents to your office for an annual sports physical. She is an accomplished varsity athlete on her high school cross-country team and feels significant pressure to set a school record during her final season. She does not bring up any health issues that are of concern to her, but upon questioning, she admits that she has not menstruated for 5 months. Her BMI is 15 kg/m2. Introduction Overview login to view 1 more bullet Epidemiology Prevalence login to view 2 more bullets Demographics login to view 3 more bullets Risk factors login to view 3 more bullets ETIOLOGY Pathophysiology login to view 1 more bullet Presentation Symptoms login to view 10 more bullets Physical exam login to view 8 more bullets Studies Serum labs login to view 4 more bullets EKG login to view 2 more bullets Tested Differential Hyperthyroidism login to view 2 more bullets Celiac disease login to view 2 more bullets Treatment Lifestyle login to view 8 more bullets Medical login to view 7 more bullets Complications Malnutrition Delayed puberty Amenorrhea Arrested growth Osteoporosis Electrolyte imbalances Cardiovascular effects login to view 3 more bullets Prognosis Morbidity 10-20% About 50% of patients make a complete recovery Worse prognosis for patients who are older (> 18 years of age) at age of onset of the disorder as well as patients with an onset before 11 years of age