⚠️ Cannabis Hyperemesis Syndrome Diagnostic Simulator

Long-Term Heavy Cannabis Use

A quiet, years-long prelude of near-daily use.

• 5+ yrs: Typical use before onset (often longer, near-daily)
• Daily: Use frequency reported (in most CHS cases)
• 20–35: Age at symptom onset (typical range)
• ~6%: Prevalence in daily users (estimated, ED cohorts)

A long, silent runway

Heavy, chronic use precedes symptoms by years, not weeks.

Cannabinoid accumulation

Lipophilic cannabinoids build up in fat tissue over time.

Why this history matters

Duration of use is a key diagnostic anchor point.

Cyclical Nausea & Vomiting

Severe cyclic vomiting despite cannabis’s antiemetic reputation.

• Cyclical: Episode pattern (recurring bouts)
• 24–48 hrs: Episode duration (per bout, typical)
• ~85%: Abdominal pain reported (of CHS episodes)
• Multiple: ED visits per patient (before diagnosis)

The paradox

Usual antiemetic effects reverse into severe cyclic vomiting.

Symptom clusters

Nausea, retching, and abdominal pain cluster in cycles.

Between-episode phase

Patients often feel well between distinct vomiting cycles.

Compulsive Hot-Shower Bathing

Hot water relief is the syndrome’s signature clue.

• ~90%: Patients reporting relief (across case series)
• Minutes: Relief onset (after hot water exposure)
• Compulsive: Behavior pattern (repeated long showers)
• High: Diagnostic weight (distinguishes from CVS)

The behavior

Patients bathe repeatedly, often for hours, seeking relief.

Proposed mechanism

Thermoregulatory shift may transiently ease symptoms via heat.

Why it stands out

Few other conditions share this specific relief pattern.

Differential Diagnostic Workup

Other causes of cyclic vomiting must be excluded.

• CVS: Key differential (cyclic vomiting syndrome)
• Normal: Imaging typically (GI structure unremarkable)
• Nonspecific: Labs typically (mild dehydration signs)
• Days: Workup duration (until causes excluded)

Ruling out GI causes

Obstruction, ulcers, and infection are excluded by testing.

Cyclic vomiting syndrome

CVS lacks the cannabis history and hot-shower relief pattern.

Building confidence

Excluding mimics sharpens the CHS diagnostic picture.

Cessation Confirms the Diagnosis

Stopping cannabis resolves symptoms — the definitive test.

• Cessation: Treatment (only definitive therapy)
• Days–weeks: Symptom resolution (after stopping use)
• Common: Relapse on resumption (symptoms recur)
• High: Final Dx confidence (history + relief + response)

Cessation as confirmation

Symptom resolution after stopping cannabis confirms the diagnosis.

Counseling patients

Patients need clear explanation of this paradoxical mechanism.

Long-term outlook

Sustained abstinence prevents symptom recurrence long-term.