A Ranked Runner With Amenorrhea, a Stress Fracture, and a Mother Asking for 'the Pill'
Maya, 16, is a nationally ranked cross-country runner seen with 3 months of amenorrhea and a second metatarsal stress fracture confirmed on MRI. She trains 60 miles a week, is 5'6" and 103 lb (BMI 16.4, down from 118 lb two years ago). She eats "clean," has cut out dairy and meat, and says she is "never hungry anymore." Resting heart rate 46, temperature 35.9°C, and fine lanugo on her forearms. She asks to keep running; her mother says she "is just a dedicated athlete" and asks whether Maya can "get the pill to fix the missed periods." The coach has been supportive. She denies purging and has no history of depression.
1. How do you reason through the diagnosis, and what does the pill actually change?
Read the worked answer
This is not "just" athletic amenorrhea. BMI 16.4 (roughly 80% of the median for age), a 15-lb decline over two years, restrictive intake with whole food groups eliminated, 3 months of amenorrhea, a second stress fracture, lanugo, bradycardia, and hypothermia point to anorexia nervosa with relative energy deficiency in sport. The mechanism is low energy availability suppressing the hypothalamic-pituitary-ovarian axis - the amenorrhea is a symptom, not the disease.
Exclude mimics: thyroid disease, celiac disease, inflammatory bowel disease, and diabetes. Check TSH, CBC, CMP with magnesium and phosphorus, ESR/CRP, celiac serology, and urine pregnancy test. Low LH, FSH, and estradiol with this body habitus supports functional suppression; polycystic ovary syndrome does not fit.
The pill does not fix this. It masks the amenorrhea, does not restore energy availability, and has not been shown to rebuild bone in this setting. Prescribing it would give the family false reassurance while the cardiac and skeletal risks continue to accumulate.
Judgement point: the mother is asking a medication question; the correct answer is a treatment-plan question.
2. What do you decide about running and level of care, and how do you frame it so she will hear it?
Read the worked answer
She already has a fracture, so the running question is partly answered: no running now. The harder judgement is level of care. A resting heart rate of 46 and a temperature of 35.9°C approach adolescent admission thresholds (commonly heart rate <50, temperature <35.6°C, orthostatic instability, or weight <75% of median). I would check orthostatic vitals and an ECG, then decide between inpatient medical stabilization and a structured intensive outpatient program.
Return-to-play contract I would write: no running until medically stable - resting heart rate above 50, normal orthostatics and temperature, consistent intake with weight trending upward, and evaluation by sports medicine and a dietitian. Then a graded return, not a return to 60 miles a week.
Framing matters: continued running risks a third fracture, and in a low-estrogen state she is also losing the window for peak bone mass accrual - some of that loss is permanent. Present restriction as protecting her career rather than ending it. Athletes and coaches respond to that framing far better than to a lecture about weight, and it keeps her engaged in the plan instead of negotiating against it.
3. How do you handle the mother's request for oral contraceptives and the coach's involvement?
Read the worked answer
With the mother: validate her pride in her daughter, then be direct - the pill is not the treatment, and prescribing it would give everyone false reassurance while bone loss and cardiac risk continue. The treatment with the best evidence in adolescents is family-based treatment: she and her partner supervise meals and snacks, restore structure, and stop negotiating at the table. A dietitian and therapist are part of the team, not optional extras.
With the coach, by consent only. I would ask Maya to sign a release so I can share the return-to-play plan and the medical restriction. Without it, I can offer general guidance about a runner with a bone stress injury, but not her diagnosis or weight. If the coach pressures her to compete, that conversation happens with Maya present.
Safety screen: ask about depression, self-harm, purging, and suicidality - rates are elevated in anorexia, and "never hungry anymore" plus lanugo plus bradycardia warrants a low threshold.
What would change my answer: medical instability or a family unable to supervise meals would move her to a higher level of care rather than outpatient family-based treatment.