Postoperative nausea and vomiting are common. Cannabinoid hyperemesis syndrome (CHS) is less common, but it can look similar in a person who uses cannabis regularly. A 2025 case report shows why a clear cannabis-use history matters after surgery.
What happened after surgery?
The patient had a gynecologic procedure that included a mid-urethral sling. Nausea and vomiting began on the first day after surgery.
Several explanations were possible. Anesthesia and opioid medicines can cause nausea. A surgical complication can also cause vomiting. Those possibilities need appropriate medical assessment before CHS is assumed.
The abdominal examination did not show tenderness or distention. The team gave ondansetron and metoclopramide. Vomiting continued into the second postoperative day.
The team then asked more detailed questions about substance use. The patient reported daily cannabis use for about two years. She used roughly one gram of cannabis flower per day.
That history changed the clinical picture. Chronic cannabis exposure, repeated vomiting, and a limited response to standard anti-nausea treatment raised concern for cannabinoid hyperemesis syndrome.
By the fourth postoperative day, the patient had improved. She progressed from ice chips to soft food and went more than 12 hours without nausea or vomiting. She was discharged with counseling to stop cannabis use.
Why can CHS be missed after surgery?
Vomiting after surgery has many possible causes. Medication effects, anesthesia, infection, bowel problems, and surgical complications may all need to be considered. CHS can be overlooked because its symptoms overlap with those conditions.
Cannabis can also seem like an unlikely cause. Many people know it as a treatment for nausea. With CHS, however, long-term cannabis exposure is linked to recurring episodes of severe nausea and vomiting.
A patient may not mention cannabis unless a clinician asks directly. Stigma can affect disclosure. Some people also do not realize that cannabis could be related to their symptoms.
Questions that can help the clinical history
A respectful, nonjudgmental history can help a care team see the full pattern. Useful questions may include:
- How often does the person use cannabis?
- Which products and THC strengths do they use?
- How long have they used cannabis regularly?
- Did similar vomiting episodes happen before surgery?
- Do hot showers or baths temporarily reduce the symptoms?
- Did symptoms improve during a period without cannabis?
These answers do not diagnose CHS by themselves. Clinicians must still evaluate other causes, especially after a procedure.
What does this case mean for patients?
Tell the surgical and anesthesia team about cannabis use before a procedure. Include edibles, vapes, concentrates, flower, and medical cannabis. This information helps clinicians plan care and interpret symptoms if vomiting occurs.
If vomiting is severe, you cannot keep fluids down, or you have fainting, confusion, chest pain, very dark urine, or severe pain, seek urgent medical care. Do not assume that postoperative vomiting is CHS.
For a broader overview, read the complete guide to cannabinoid hyperemesis syndrome. If an episode is happening now, review the CHS Action Plan and its urgent warning signs.
What should perioperative teams take from the report?
The report supports routine, clear questions about cannabis use before surgery. It also shows the value of revisiting the history when postoperative vomiting does not follow the expected course.
Early recognition may reduce repeated medication trials and unnecessary delays. It can also make discharge counseling more specific. Complete cannabis cessation remains central when CHS is suspected or diagnosed.
Study source
This article summarizes one case report. A single case cannot establish how common CHS is after surgery or replace clinical guidelines.
Selected clinical references
- AGA Clinical Practice Update on CHS diagnosis and management (2024)
- NCBI Bookshelf: Cannabinoid Hyperemesis Syndrome
- Cleveland Clinic: CHS symptoms, causes, and treatment
Sources are selected for the topic of this page. CHS SOS provides general education, not diagnosis or individualized medical advice, and does not describe content as medically reviewed unless that is explicitly stated.
Questions readers often ask
What is the main takeaway from “Cannabinoid Hyperemesis Syndrome After Surgery: What a Case Report Shows”?
A 2025 case report shows how cannabinoid hyperemesis syndrome can resemble postoperative nausea and why a clear cannabis-use history matters.
What pattern makes CHS different from occasional nausea?
CHS is associated with prolonged cannabis exposure and a recurring pattern that may progress through prodromal, hyperemetic, and recovery phases. Hot bathing behavior is common, but no single symptom proves CHS.
What should I do next if I am still unsure?
Use the CHS Symptom Check to organize the pattern, review the CHS Action Plan, and bring your timeline to a qualified clinician. Seek urgent care now if severe vomiting or dehydration warning signs are present.
Medical disclaimer: CHS SOS provides educational information and does not diagnose or treat medical conditions. Seek advice from a qualified healthcare professional.
