Man Who Does Not Believe Cannabis Is Causing His Vomiting — Free SCA Practice Case
Man who does not believe cannabis is causing his vomiting
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
Elliot Varley
Age
30 years
Consultation Type
VideoAge
30
Situation
Video Consultation. Routine appointment after admission.
Reason for Encounter
"In hospital the week before last with being sick. Would like to talk about the discharge letter."
Medical Records
- ●PMH: Anxiety age 19. Recurrent vomiting.
- ●Medications: None.
- ●Allergies: NKDA.
- ●Social: Barber.
Recent Notes
- ●Discharge summary, 12 days ago: Admitted overnight with vomiting and abdominal pain. Daily cannabis for ten years. Given IV fluids. Suspected cannabinoid hyperemesis syndrome; advised to stop cannabis. Please repeat U&E in 1 to 2 weeks.
- ●Bloods: Admission K 3.1, creatinine 131 (84 four months ago). Before discharge K 3.9, creatinine 102.
Patient Script
For the friend playing the patient role
Character Overview: You are Elliot Varley, a 30 year old self employed barber who rents a chair and pays the rent every week whether you work or not. You live with your partner Kerys, a teaching assistant, and are saving for a deposit. You do not drive. You have smoked cannabis daily since you were 20, starting as an anxious teenager who could not switch off at night. You now have your first one in the morning, because you wake up queasy and it settles your stomach enough to face breakfast. You have had six attacks of vomiting in fourteen months, closer together now, and only a very hot shower helps. You have been to hospital three times, the last time the week before last, kept in overnight. The doctor said it was the cannabis, told you to stop and gave you a leaflet you binned. You felt written off as a stoner wasting a bed, and you honestly think they have got it wrong: ten years without a problem, cannabis is the one thing that settles your stomach, and ten days off on holiday about three months ago did not stop you being sick. You are friendly and chatty, but tired and defensive about the hospital. If the doctor listens to your side properly, you relax and become curious.
Opening Sentence: "Hi, thanks for this. So I ended up in hospital again the week before last with the sickness, and their letter basically says it's down to me smoking weed. I've smoked for ten years without a single problem, so I honestly think they've got it wrong. I want someone to actually look into it properly."
History if Asked (Data Gathering Phase)
- ●What the attacks are like: "It starts with a day of feeling rough. Queasy, sweaty, right off my food. Then I'm being sick every ten, fifteen minutes, and when there's nothing left I'm just retching. My belly cramps up round the middle. That goes on two, three days, then it stops and I'm back to normal."
- ●How often, and in between: "Six times in fourteen months. Lately every six to eight weeks. I'm fine in between, no pain, just a bit queasy most mornings until my first smoke."
- ●What helps during an attack (if asked about baths or showers): "Only one thing. Standing under the shower, as hot as it'll go, half an hour, forty minutes, then back in an hour later, all night sometimes. It only works while I'm under it." If asked about problems or safety: "Last time my back came up bright red and sore, so I suppose I scalded it. And once I nearly blacked out stepping out of the shower. Kerys found me sat on the bathroom floor. That really frightened her."
- ●The hospital visits: "A&E about seven months ago and again four months ago, a drip and home, and a normal scan the second time. The week before last they kept me in. They said my kidneys had taken a knock and my potassium was low. The doctor just said, it's the cannabis, stop smoking it. It felt like she'd made her mind up the second she saw the word."
- ●How he is today (if asked about being sick, drinking, passing urine or dizziness): "Fine now. Not sick since I came out. Eating, drinking and weeing normally, no dizziness."
- ●How much he smokes (if asked): "Four or five a day, more on a day off. Since the hospital I've cut down to about three a day. But I still need one in the morning or I can't face food." Joints rolled with a bit of tobacco. He smokes at the start of an attack because it settles it, but not once he is properly being sick.
- ●Confidentiality worry (after he has answered the questions about how much he smokes): "This stays between us, yeah? It's not going to the police or anything?"
- ●Ever tried to stop (if asked): "Ten days off about three months ago, my cousin's wedding in Spain. I was a nightmare. Couldn't sleep, sweating all night, snapping at everyone. On day eight I was sick again, two days in the hotel shower. So it can't be the weed, can it? I wasn't even smoking."
- ●Why he smokes (if asked): "It's how I switch off. I was a proper worrier as a teenager, panic attacks before exams. Without a smoke I lie there half the night."
Ideas, Concerns, Expectations
Gating note: Elliot volunteers only that he thinks the hospital got it wrong. Each part below comes out only when the doctor asks what he thinks is going on, what is worrying him, or what he was hoping for.
- ●Ideas: Something in his stomach goes into a spasm and gets stuck, and the heat relaxes it. "The heat relaxes it, like a hot water bottle on a bad back. And the weed's the only thing that calms my stomach, so how can it be making it bad?"
- ●Concerns: He feels written off. "As soon as they hear weed, you're a stoner and nobody looks any further." If the doctor explores further: "What scares me is not having it. It's how I sleep."
- ●Expectations: "I want something stronger than whatever they gave me on the drip, to keep at home for when it starts. And I want to see a proper stomach specialist who'll run every test going."
If Asked: Medical History and Medications
Gating note: Elliot answers each of these plainly when the doctor asks about it.
- ●Health, medicines, allergies, operations: "Just the anxiety when I was younger, leaflets from a GP at nineteen, no tablets. No operations, no medicines, no allergies, no diabetes or thyroid that I know of."
- ●Alcohol, other drugs, family: "Two or three pints on a Saturday. No other drugs. Nobody in the family has had anything like this."
Social History and Lifestyle Impact
- ●Work: Self employed, no sick pay. "Three Saturdays I've lost in the last few months, and Saturday's my best day. A couple of weeks ago I had to cancel a stag party. No haircuts, no money, and the chair rent still comes out every Monday."
- ●Home: Together with Kerys four years. She does not smoke. "She's been on at me to pack it in for ages. After she found me on the bathroom floor she was in bits."
- ●Routine, sleep, mood: "First one before work, one at lunch, a couple in the evening to switch off. Fed up with being ill, not low."
If Asked: Associated Symptoms
- ●If asked about vomiting blood or coffee grounds, black stools, trouble swallowing, yellow skin or eyes: "No blood, just watery, bitter stuff once there's nothing left. Bowels normal. Nothing sticks. No yellow."
- ●If asked about pain or sickness between attacks, weight, fever, thirst or passing a lot of urine: "No pain, just the morning queasiness. Weight's about the same. No temperature. Not thirsty."
- ●If asked about headaches, vision, weakness, numbness, heartburn, chest pain, thoughts of harming himself, paranoia or hearing things: "No, nothing like that."
Responses to Management (The Negotiation Phase)
- ●If the doctor agrees with the hospital before hearing his side, or asks why he thinks they got it wrong:
- ●Reaction: If the doctor sides with the hospital first, flat and irritated: "So you've read the letter and that's it. Same as them." If asked, he relaxes: "Thank you. That's all I wanted, someone to actually listen." He then gives his three reasons: ten years with no problem, the weed settling his stomach, Spain.
- ●If the doctor explains how cannabis can cause the sickness, or why hot showers help:
- ●Reaction: Sceptical. "Ten years and nothing, and then all of a sudden it turns on me? How does that work? A smoke first thing is the only thing that lets me eat breakfast." He settles if told the morning smoke may be masking the queasiness. If told most people with this find hot showers help: "Other people do the shower thing? I thought that was just me."
- ●If the doctor recommends stopping cannabis completely, or has not explained the ten days off:
- ●Reaction: "I've already cut down. Isn't about three a day enough?" If told it will not stop the attacks he is unhappy. If the break is not explained: "I was sick on day eight in Spain. Explain that one." He accepts it if told attacks can carry on for weeks or months after stopping. If stopping is offered as a test, with a review and further tests if attacks carry on: "Alright. If I do it properly and I'm still being sick, you'll send me to the specialist? Deal."
- ●If the doctor explains what stopping feels like, suggests a gradual stop to a set date, mentions tobacco, or suggests the drug and alcohol service or help with anxiety and sleep:
- ●Reaction: Worried. "When I stopped in Spain I was a nightmare. How am I meant to cut hair on no sleep?" Relieved by a short reduction to a set date, and open to patches or gum. On a drug service he bristles: "I'm not some addict. Do they tell anyone?" He agrees to self refer if told it is free and confidential. On anxiety help: "I'm not depressed, I just can't switch off." Interested if it is put as help with sleeping without a smoke.
- ●If the doctor declines or limits anti sickness tablets, does not refer him to a specialist for now, or gives vague safety netting:
- ●Reaction: Frustrated. "So I go home with nothing again? What am I meant to do when it kicks off in the middle of the night?" He settles with a clear plan. "What if it's something else and everyone's just blaming the weed?" Vague safety netting: "Bad how? At what point is it a hospital job?"
- ●If the doctor asks for a blood test, asks him to press on his tummy on camera, or explains what happens if he stops for good:
- ●Reaction: "Not a Saturday. Can I come in first thing, before the shop opens?" He declines to press his tummy: "I wouldn't know what I was feeling for. I can come in." If told he can recover: "Does it all go back to normal? No lasting damage?"
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
- ●Elliot has typical cannabinoid hyperemesis syndrome (CHS) and rejects the diagnosis because cannabis settles his stomach, he has smoked for ten years, and he was sick on day eight of a break. The skill is to explain the paradox in his terms, agree a fair test of stopping, make the hot showers safer, support him with withdrawal and the anxiety underneath, and follow up the kidney injury the hospital flagged.
- ●Model plan: hear his case first, support the working diagnosis with reasons, explain that complete stopping is the only treatment and takes months to judge, plan the stop with support, no repeat anti sickness prescription, a clear safety net, repeat U&E in the next few days and review in a few weeks. Refer to gastroenterology if attacks continue after sustained abstinence, or sooner with warning features.
- ●Also acceptable: a short planned reduction to a fixed stop date instead of an immediate stop, no anti sickness medicine at all or a small one off supply to try at the start of an attack, and seeking specialist advice alongside this plan.
Recognising and Diagnosing CHS
- ●The Royal College of Emergency Medicine (RCEM) best practice guideline (February 2024) advises considering CHS in anyone with cyclical vomiting who uses cannabis. Suspicion features: cyclical severe vomiting over months, age under 50, at least weekly use, compulsive hot showers or baths that relieve symptoms (about nine in ten), abdominal pain, and use for over a year.
- ●There is no confirming test. Rome IV (2016) requires stereotyped episodic vomiting after prolonged heavy use, relieved by sustained cessation. The American Gastroenterological Association (AGA, 2024) gives at least three attacks a year and resolution after at least six months of abstinence, or as long as three of the person's usual cycles. That is where the commonly quoted six months comes from; it is a United States expert definition and no UK guideline gives a number. For Elliot, three cycles is about four to six months, so a review point counted in months is what matters.
- ●UK guidance is thin: RCEM is the only national guidance, written for emergency departments, with no NICE guideline, CKS topic or BNF entry. The hospital rightly wrote "suspected" CHS, because a trial of abstinence is both the treatment and the confirming test.
Other Causes and When to Investigate
- ●RCEM stresses excluding another cause, including central nervous system and intra abdominal disease, infection, cyclic vomiting syndrome, diabetic ketoacidosis, hypercalcaemia and other drugs. Red flags include unintentional weight loss, an abdominal mass, change in bowel habit, anaemia and abnormal liver tests.
- ●NICE NG12 recommends a suspected cancer pathway referral for dysphagia at any age, and for nausea or vomiting only at 55 and over with other features. Elliot is 30 with no dysphagia, haematemesis, weight loss or symptoms between attacks, and normal bloods and ultrasound. A camera test or scan adds nothing now.
Explaining the Paradox, and Hot Showers
- ●Patients struggle to accept CHS because attacks are not timed with extra use, cannabis often eases nausea in the short term, weeks or months separate attacks, and it can start after more than eleven years of use (RCEM). Small doses of THC have an anti sickness effect; long term heavy use is thought to disturb the body's own cannabinoid system, which helps regulate nausea, gut movement and temperature, so the effect reverses. A morning smoke may mask the queasiness and keep the cycle going.
- ●Relief from hot showers is reported by most people with CHS and lasts only while in the water. It is thought to act through heat sensing TRPV1 receptors, the same target as topical capsaicin. Hot water is a reasonable comfort measure but treats nothing.
- ●The risks are real: serious scalds and fainting from dehydration plus heat. Elliot has scalded his back and nearly collapsed. Advise water hot enough to help but not burn, an unlocked door, getting out and sitting if dizzy, and sipping fluids.
Stopping, Withdrawal and Tobacco
- ●Abstinence is the only treatment shown to prevent CHS (RCEM), and cutting down will not clear it. Improvement is not immediate and can take weeks to several months, so ten days was too short a test. If he restarts, attacks are likely to return; if he stays off, full recovery is expected.
- ●The AGA advises against stopping "cold turkey" because relapse is common, while RCEM is clear that only complete stopping works. A quit date soon with support, or a short planned reduction to a fixed stop date, are both reasonable. Reduction is a route to stopping, not an end point.
- ●Withdrawal: irritability, anxiety, poor sleep, vivid dreams, poor appetite, sweating. It starts within 24 to 48 hours, peaks around days 2 to 6 and mostly settles in two to three weeks, though sleep can take longer. No medicine is licensed or recommended for cannabis dependence (UK clinical guidelines, 2017), and benzodiazepines and hypnotics carry their own dependence risk.
- ●Elliot rolls with tobacco, so stopping the joints also stops nicotine. NICE NG209 recommends stop smoking services and combination nicotine replacement.
Support and Confidentiality
- ●NICE CG51 recommends opportunistic brief interventions in primary care, normally two sessions of 10 to 45 minutes. Local drug and alcohol services are free, confidential and usually accept self referral. FRANK (talktofrank.com) gives advice, and RCEM recommends written information.
- ●His use began as a way of managing anxiety and sleep, so NHS Talking Therapies, which accepts self referral, fits (NICE CG113 for generalised anxiety disorder).
- ●Cannabis is Class B but a GP does not report a patient's personal use to the police. GMC guidance permits disclosure without consent only where the public interest outweighs the patient's interest, such as serious harm or crime. The diagnosis is already in his GP record, which is confidential.
Anti Sickness Medicine and Managing Attacks
- ●CHS is often resistant to routine antiemetics and opioids are frequently unhelpful (RCEM). In the emergency department RCEM suggests intramuscular haloperidol after an ECG, or topical capsaicin 0.1% cream; neither goes home without a specialty plan.
- ●No UK guidance covers primary care antiemetics. The sensible model is no regular or repeat prescription, because it will not prevent attacks and distracts from stopping. Prescribing nothing, or a small one off supply for the start of an attack as a stop gap, are both reasonable. Metoclopramide is limited to 5 days at 10 mg up to three times a day (MHRA 2013), and domperidone to the lowest dose for the shortest time, normally up to a week (MHRA 2014).
Complications, Safety Netting and Follow Up
- ●Complications come from fluid and food loss: acute kidney injury, low potassium and other electrolyte disturbance, low blood sugar and, rarely, death (RCEM). Elliot's creatinine rose from 84 to 131 µmol/L, about 1.6 times baseline, which is stage 1 AKI, with potassium 3.1. It was 102 at discharge, so the repeat U&E is due now.
- ●After AKI, NICE CKS advises recording it in the primary care record and monitoring creatinine, eGFR and urine albumin to creatinine ratio for at least 3 years even if eGFR returns to baseline (NICE NG203).
- ●Same day assessment through NHS 111, A&E or the practice: unable to keep fluids down, severe vomiting for a day or more, passing little urine, feeling faint on standing, or cramps, weakness or palpitations that may signal low potassium. 999 or A&E for vomiting blood or coffee ground material, black stools, severe chest or upper abdominal pain after forceful retching, collapse or confusion. Contact the practice if mood drops, and the same day for thoughts of self harm.
- ●Review within a few weeks for the result, withdrawal, sleep, mood and progress, which doubles as the second CG51 brief intervention.
Common Mistakes in This Station
- ●Repeating the hospital's verdict before hearing why he doubts it.
- ●Agreeing to a specialist referral or camera test to placate him, in place of a trial of stopping.
- ●Not asking what eases the attacks, so the shower clue, the scald and the near faint are missed.
- ●Banning hot showers outright rather than making them safer.
- ●Accepting cutting down as enough, or promising attacks will stop within days.
- ●Failing to explain why ten days off did not settle it.
- ●Offering an antiemetic on repeat as the treatment, or metoclopramide beyond 5 days.
- ●Missing the repeat U&E the hospital asked for.
- ●Ignoring the anxiety and sleep problems behind his use, and the tobacco in his joints.
- ●Safety netting limited to "come back if it gets worse".
Mapped to the RCGP curriculum topic: Gastroenterology.
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