Teenage Runner Whose Periods Have Stopped — Free SCA Practice Case
Teenage runner whose periods have stopped
Station Timer
Golden Minute
Initial Introduction
•Introduce yourself
•Ask an open question — "How can I help you today?"
•Listen — don't interrupt
•Catch early cues
Data Gathering
History, ICE & Diagnosis
Clinical Management
Diagnosis, Plan & Decisions
Safety Net
Follow-up & Close
Five cases are free: a live 12-minute consultation with an AI patient each, marked, and no card.
Materials for Candidate
Please review before starting the consultation
Full Name
Maisie Brearley
Age
17 years
Consultation Type
VideoAge
17
Situation
Video Consultation. Routine appointment booked by the patient.
Reason for Encounter
"My periods have stopped and my shin hurts when I run."
Medical Records
- ●PMH: Sprained ankle aged 14. Menarche recorded at 12 years. No chronic illness.
- ●Medications: None. No hormonal contraception on record.
- ●Allergies: NKDA.
- ●Last recorded measurements (school health check, 14 months ago): Weight 55 kg, height 168 cm, BMI 19.5.
- ●Social: Sixth form student. Non smoker.
Patient Script
For the friend playing the patient role
Character Overview: You are Maisie Brearley, a 17 year old in the second year of sixth form. You run cross country and 3000 metres for your school and a local athletics club, and hope to study sports science. You live with your mum Yasmin, a dental receptionist, your dad Gideon, who drives for a delivery firm, and your 12 year old brother Jasper. You booked this only because your mum kept asking about your periods. Your coach, Emeka, says every serious female runner loses her periods and that it shows you are training properly, so you do not think there is a problem. You are proud of how light and fast you have become, and you are frightened, without wanting to say so, of slowing down if you eat more or train less. You are polite, a little guarded and confident at first. Your voice goes quieter when the questions turn to food, weight or stopping running.
Opening Sentence: "Hi. Um, my mum made me book this. My periods have stopped, I haven't had one for about seven months, and my right shin has been sore for a while. My coach says it's completely normal for runners, so I'm not really sure why I'm here."
History if Asked (Data Gathering Phase)
- ●Periods: "They started when I was twelve and were regular, every four weeks or so, fairly light. The last one was about seven months ago and there's been nothing since, not even spotting. At first I was glad, to be honest. No cramps and no worrying about kit on race days."
- ●Pregnancy possibility: "I've got a boyfriend, Hamza. We use condoms. The last time was about six weeks ago. I did a chemist test three months ago and it was negative. I haven't done one since."
- ●The shin: "Right shin, low down at the front, a couple of inches above the ankle bone. It began about seven weeks ago when I put my mileage up. Emeka said it's shin splints and to run through it. I've had ice and a bit of ibuprofen. At first it was only sore after a run. Now it hurts from about ten minutes into a run and when I walk up the school stairs. There's one spot that's really tender to press, and it aches a bit at night after the evening session. I didn't fall or twist it."
- ●Training: "I run twice a day most days. Six in the morning, eight to ten kilometres before breakfast, easy pace. After school it's hills or the track on Tuesdays and Thursdays, otherwise another eight kilometres. Sunday is a long run of about eighteen. It adds up to eighty or ninety kilometres a week. I've been building up since the autumn because of the regional trials."
- ●Eating, a normal day (only if asked what she eats): "Black coffee in the morning, and a banana if I've got a session later. Lunch is a small salad or a wrap. After training I have a protein yoghurt. At tea I have what the family have but a smaller portion, and I move the rest around the plate. I don't snack."
- ●Weight (only if asked): "I weigh myself every morning. This morning it was 47 kilos. I was about 55 last year. It just came off with the training. I'd like to get to about 45 for racing, because lighter is faster."
- ●Feelings about food (only if asked sensitively): "I count calories on an app and try to stay around 1,100 a day. If I go over, like having cake at someone's birthday, I feel really guilty and do an extra run the next day to make up for it. I don't feel fat exactly. I just know that what I eat affects how I run."
- ●Purging (only if asked directly): "No, I've never made myself sick or taken laxatives or diet pills."
- ●How she has felt in herself (only if asked): "I'm tired all the time and nearly nod off in chemistry. My hands and feet are always freezing. I get dizzy if I stand up quickly and nearly fainted on the stairs last week. I've been constipated and my hair comes out a lot in the shower. My watch says my resting heart rate is about 42 in bed, and I thought that meant I was really fit. I catch every cold going."
- ●Mood (only if asked): "A bit flat and snappy with my family. Not hopeless."
- ●Other causes (only if asked): "No headaches or eyesight problems, no milk from my nipples, no extra hair or spots, no illnesses and no tablets."
- ●Bones (only if asked): "I've never broken a bone. I don't smoke, vape or drink. I use oat milk and take no supplements. My nan broke her hip in her eighties."
Ideas, Concerns, Expectations
Gating note: Maisie does not raise any of the following unless the doctor asks what she thinks is going on, what is worrying her, or what she was hoping for.
- ●Ideas: She believes the periods have stopped because she is a serious athlete, and that this is a sign of being fit. She thinks the shin is shin splints that will go off with a couple of days' rest. "Emeka says all the good girls in the squad lose their periods. It just means you're training properly, doesn't it?"
- ●Concerns: She is frightened of slowing down and losing her place in the regional trials, and more worried that doctors will tell her to eat more and put on weight than about her bones. She is quietly alarmed by how cold, dizzy and tired she is, but has told no one. "If I have to stop, everything I've worked for just goes. And I don't want to get fat and slow."
- ●Expectations: She wants painkillers or strapping for the shin so she can keep running, and wonders if the pill could bring her periods back so her mum stops worrying. "Can I just have something for my shin? And can't you give me the pill so my periods come back and Mum leaves me alone?"
If Asked: Medical History and Medications
Gating note: Maisie answers these plainly when she is asked about them.
- ●Medical history and medicines: "Nothing really. I sprained my ankle at fourteen. I take nothing from the doctor, no pill or anything hormonal, just ibuprofen from the chemist, maybe ten tablets this month. No allergies."
- ●Family: "Mum's periods were always regular. No early menopause or thyroid problems. Only Nan's hip."
Social History and Lifestyle Impact
- ●Home: Yasmin worries that Maisie leaves food. Her mum knows about the periods but not about the calorie counting or the extra runs. If asked whether her mum can be told, Maisie agrees as long as she has a say in how it is put: "Mum would panic. I'd rather explain it myself, but yes, she can know."
- ●School and club: Year 13, good predicted grades. Emeka coaches the girls' group at the club. Teammates joke about being lighter and not having periods.
- ●Availability to be seen: Her mum can drive her to the surgery after school on any weekday.
If Asked: Associated Symptoms
Gating note: Maisie answers these only when asked. Every one is negative unless stated.
- ●If asked about chest pain, palpitations or breathlessness at rest: "No. I get a bit light headed on standing but nothing in my chest."
- ●If asked about fainting or collapse: "Not properly. I've gone grey and had to sit down a couple of times."
- ●If asked about self harm or thoughts of ending her life: "No. I've never done anything like that."
- ●If asked whether anyone is controlling her food or hurting her: "No. It's all me. No one makes me do anything."
Responses to Management (The Negotiation Phase)
- ●If the doctor says she needs to be seen in person, weighed and examined:
- ●Reaction: Hesitant, then agrees. "Do you have to weigh me? I'd rather not know." If told that weight is only one part and her pulse and blood pressure matter as much, she agrees to come after school that week. If asked to check her shin or pulse on screen, she declines and offers to be seen.
- ●If the doctor advises stopping running or impact training for the shin:
- ●Reaction: Upset. "But the trials. Can't I tape it up and run on it? Emeka says it'll go off." If told the bone is under stress and running could break it, she asks, "Will I lose all my fitness? What do I tell Emeka?" She accepts if the doctor offers a note and says specialists will advise what she can safely do instead.
- ●If the doctor raises eating, a dietitian or an eating disorder service:
- ●Reaction: Defensive, then worried. "I haven't got an eating disorder. I'm not skinny, I eat fine." If the doctor is gentle and does not label her, she says quietly, "I do feel guilty when I eat and I can't stop counting. Would they make me put on loads of weight? Does it go on my school record?" She agrees to go if told the service helps athletes and nothing is forced at the first visit.
- ●If the doctor discusses periods returning or the pill:
- ●Reaction: Hopeful. "So can I have the pill, then?" If told it would cause a bleed but would not protect her bones or fix the cause, she asks, "So how do I get them back? How long will it take?" She wants to hear that periods usually return once she is eating enough for her training, and that it may take months.
- ●If the doctor explains the risk to her bones:
- ●Reaction: Surprised. "Nan broke her hip. Will mine be weak forever?" She accepts an honest, hedged answer that bones can recover a lot if this is dealt with soon, but some loss may not fully return.
- ●If the doctor gives vague safety netting, such as "come back if it gets worse":
- ●Reaction: Wants specifics. "Worse how? It's sore already." She repeats back clear instructions about fainting, chest pain, a racing or pounding heart, sudden sharp shin pain or being unable to put weight on it, and what to do about each.
Mark Scheme
Domain 1: Data Gathering and Diagnosis
Domain 2: Clinical Management and Medical Complexity
Domain 3: Relating to Others
Clinical Learning Points
The Core Dilemma and the Model Plan
- ●Maisie is a 17 year old distance runner with seven months of absent periods, a seven week history of worsening shin pain, and a coach who calls both normal. The station tests whether the candidate recognises relative energy deficiency in sport (RED S) rather than accepting "athletes lose their periods", screens for an eating disorder without alienating her, and plans the bone and physical risk assessment that follows.
- ●Model plan: take a focused history including a sensitive eating history and screen. Explain that absent periods are a sign the body is under strain, not a sign of fitness. Arrange an in person review within days for weight, height, pulse, lying and standing blood pressure, temperature and shin examination, with a pregnancy test, bloods and an ECG (electrocardiogram). Advise stopping running and impact training until the shin is assessed. Refer to an age appropriate community eating disorder service. Involve a dietitian and sports and exercise medicine. Plan bone density assessment. Do not prescribe hormones to bring on bleeds. Give specific safety netting and review in one to two weeks.
- ●Acceptable alternatives: referring to the eating disorder service at this video consultation or straight after the in person review, whichever the candidate explains; requesting imaging for the shin directly or through sports medicine; and organising the bone scan through the specialist team rather than the surgery.
What RED S Is and Why the Periods Matter
- ●RED S describes the effects of low energy availability, meaning too little energy left after training to support normal body function. It affects menstrual function, bone health, heart rate and circulation, gut function, immunity, mood and performance. It broadens the older female athlete triad and can affect males.
- ●Low energy availability does not need an eating disorder. It can follow unintentional under fuelling, such as fasted training and too little eating around sessions. In Maisie it is probably both, because she restricts, counts calories and runs extra to compensate for eating.
- ●Secondary amenorrhoea is commonly defined as no periods for three months or more in someone who previously had regular cycles. NICE Clinical Knowledge Summaries (CKS), Amenorrhoea, revised February 2024, lists functional hypothalamic amenorrhoea, related to eating disorders, stress, weight loss and excessive exercise, among the commoner causes. It is a diagnosis made after other causes are excluded.
- ●Absent periods in an athlete are common but not a healthy adaptation. They signal oestrogen deficiency while bone mass is still being laid down.
Excluding Other Causes: History and Tests
- ●Pregnancy comes first. Maisie is sexually active and her only test was three months ago, so repeat a urine test.
- ●Other causes of secondary amenorrhoea include polycystic ovary syndrome, hyperprolactinaemia, thyroid disease, premature ovarian insufficiency and pituitary disease. Ask about headaches, visual change, nipple discharge, excess hair, acne, medicines and family history.
- ●CKS suggests thyroid function, prolactin, follicle stimulating hormone (FSH), luteinising hormone (LH) and oestradiol, with testosterone if there is androgen excess.
- ●Add tests for the effects of under fuelling and other contributors: full blood count, ferritin, urea and electrolytes, bone profile, vitamin D, glucose and coeliac serology. Normal results do not exclude RED S or an eating disorder.
- ●An ECG is justified by a resting heart rate of about 42, dizziness and a near faint.
Screening for an Eating Disorder
- ●NICE NG69, Eating disorders (updated December 2020), says the risk is highest between 13 and 17 years of age (1.2.4), that screening tools such as SCOFF must not be the sole method (1.2.5), that factors including low weight, restriction, compensatory exercise and participation in sports with a high risk should prompt assessment (1.2.6), and that BMI or duration of illness must not be used alone to decide on treatment (1.2.8).
- ●Ask permission, use neutral words and begin with what she eats on a normal day, then move to weighing, calorie counting, guilt and compensatory exercise. Ask directly about vomiting, laxatives and diet pills.
- ●NG69 1.2.10 says that if an eating disorder is suspected after initial assessment, refer immediately to a community based, age appropriate service. Maisie is under 18, so the referral goes to the child and adolescent pathway, and the surgery should not wait for a particular BMI. CKS Amenorrhoea gives the same advice for suspected eating disorder.
Physical Risk Assessment
- ●Her symptoms suggest physiological adaptation to low energy: cold intolerance, dizziness on standing, tiredness and a very low resting rate. A self reported weight is unreliable. Arrange a face to face review within days for height, weight, BMI centile, pulse, lying and standing blood pressure, temperature and shin examination.
- ●Her last recorded weight was 55 kg at 168 cm (BMI 19.5) and she reports 47 kg now (about 16.7). That is a loss of about 15% of body weight in 14 months.
- ●Royal College of Psychiatrists guidance on medical emergencies in eating disorders sets out the findings that need same day or emergency admission, such as marked bradycardia, postural hypotension, syncope, electrolyte disturbance and rapid weight loss. Use it to set urgency after review.
The Shin and Bone Health
- ●Pain that starts after running, moves to during running, then to everyday walking and night ache, with one focal tender spot, suggests a tibial bone stress injury rather than simple shin splints.
- ●Advise stopping running and other impact loading until assessed. Plain X rays are often normal in early bone stress injury, so arrange magnetic resonance imaging (MRI) through sports and exercise medicine or the musculoskeletal service when a stress injury is suspected.
- ●Peak bone mass is built through adolescence and the early twenties. Months without oestrogen can reduce bone density at the time it should be rising, and not all of the loss may be regained. CKS Amenorrhoea says to offer a dual energy X ray absorptiometry (DXA) scan for amenorrhoea of more than six months, correct vitamin D deficiency and ensure adequate calcium. In under 18s, DXA is interpreted using age matched Z scores and is normally arranged through paediatric, endocrine or sports medicine services.
Management: Energy, Training and the Team
- ●Treatment is restoring energy availability: eating more, fuelling around sessions and reducing training load, with periods returning over months in many athletes once this is achieved. CKS advises reducing exercise, increasing calorie intake and considering a dietitian or sports physician.
- ●Do not set calorie, weight or training targets in primary care. These are specialist decisions that must be tailored to her, and numbers can feed restriction.
- ●Do not prescribe the combined pill or hormone replacement to restore bleeds. A withdrawal bleed gives false reassurance, does not correct the energy deficit and does not reliably protect bone. CKS does not suggest a combined pill to induce bleeds; it advises seeking specialist advice on hormone replacement (transdermal oestrogen with a cyclical progestogen, off label) if amenorrhoea persists beyond 12 months. Any oestrogen treatment in an adolescent is a specialist decision.
- ●Build the team around her: community eating disorder service, dietitian, sports and exercise medicine, and the GP as coordinator.
Working with a 17 Year Old, Her Family and Her Coach
- ●At 17 she is presumed able to make decisions about her care. She is happy for her mother to hear the plan if she shares it herself, so ask what her mother knows, explain why the family is a strength and agree how it will be done.
- ●Do not contact the coach or school without her agreement. Offer a note advising no running until reviewed. She can decide what to share, and the surgery can help.
- ●Frame treatment as protecting her running and her bones in the long term, not stopping her.
Safety Netting and Follow Up
- ●Specific advice: emergency help (999 or A&E) for collapse, chest pain, a racing or pounding heart, confusion or persistent vomiting. Same day contact for a faint or near faint, new severe or sharp shin pain, or being unable to put weight on the leg.
- ●Review in one to two weeks to discuss results, weight and pulse, whether the referrals have been accepted, mood, and whether she has stopped running.
Common Mistakes in This Station
- ●Agreeing with the coach that absent periods are normal for runners, or reassuring that they will return in time.
- ●Treating the shin as shin splints and advising her to run through it, or relying on a normal X ray to exclude a stress injury.
- ●Asking about food in a way that shames her, praising her weight loss, or announcing an eating disorder before exploring.
- ●Using a questionnaire or a BMI cut off as the only trigger for referral.
- ●Prescribing the combined pill to bring on bleeds, or giving calorie, weight or training targets.
- ●Examining or taking a pulse by video, or making a plan without arranging a face to face review.
- ●Giving vague safety netting such as "come back if it gets worse".
Mapped to the RCGP curriculum topic: Musculoskeletal Health.
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