Nausea, Appetite, and Medical Cannabis: What the Science Says

How Recent Research Shapes Our Understanding

When patients ask about medical cannabis for nausea or appetite, the best place to start is peer‑reviewed science. All studies cited here come from PubMed, the U.S. National Library of Medicine’s database of peer‑reviewed research. The findings are still emerging, and they do not replace medical advice. If you are considering cannabis, discuss it with a licensed physician.

Gastroparesis and Cannabis Use

A 2025 review in JAMA examined the prevalence of gastroparesis—delayed stomach emptying without an obstruction—using a 2018 U.S. insurance claims database. The authors found 21.5 cases per 100,000 people, with the condition more common in women. Symptoms include nausea and vomiting, which can be debilitating. The review notes that cannabis is linked to delayed gastric emptying, potentially worsening gastroparesis symptoms. PubMed link

In a separate 2024 study published in Surgical Endoscopy, researchers investigated whether preoperative cannabis use affected outcomes after surgical treatment for gastroparesis. Using the TriNetX electronic medical record database, they compared adults who used cannabis before surgery with those who did not. The analysis showed no clear difference in postoperative complications, but the authors cautioned that limited sample size and retrospective design mean results are preliminary. PubMed link

Chemotherapy‑Induced Nausea and Appetite

Chemotherapy can cause persistent nausea and loss of appetite. A 2025 review in Current Medicinal Chemistry discussed cannabinoids as potential substitutes for traditional anti‑emetics. The authors highlighted nabilone, a synthetic cannabinoid, which is already licensed for chemotherapy‑induced emesis in some settings. While the review summarizes preclinical and early clinical data, it does not claim definitive efficacy. PubMed link

Another 2025 paper in Cancer Letters focused on cognitive decline after chemotherapy, not on nausea. However, the authors noted that cannabis‑derived compounds, including cannabidiol (CBD), showed neuroprotective effects in animal models. This suggests a broader therapeutic potential for cannabinoids, though the study did not evaluate appetite or vomiting directly. PubMed link

Veterans, Cannabis, and Cancer Treatment

A 2025 observational study in Federal Practitioner examined how often veterans with cancer reported cannabis use and explored possible drug interactions. The authors found that many patients used cannabis alongside antineoplastic agents, raising concerns about shared metabolic pathways via cytochrome P450 enzymes. While the study did not assess nausea outcomes, it underscores the importance of monitoring for interactions that could influence symptom management. PubMed link

Pregnancy, Cannabidiol, and Nausea

Pregnant women sometimes turn to CBD for nausea and vomiting. A 2024 study in Neuroscience investigated prenatal CBD exposure in rats, observing neurodevelopmental effects in offspring. The authors reported that while CBD was well tolerated during pregnancy, it could affect brain development in male and female pups. The study did not examine human nausea, but it highlights the need for caution and further research in this population. PubMed link

What the Evidence Means for Patients

• Studies show that cannabis can slow stomach emptying, which may worsen gastroparesis symptoms.
• Evidence for cannabis reducing chemotherapy‑induced nausea is limited and largely based on early trials or animal models.
• Interactions between cannabis and cancer drugs are possible; patients should inform their care team.
• Pregnancy use of CBD is not yet supported by human data, and animal studies raise developmental concerns.

Because the science is still developing, these findings should be viewed as general information rather than definitive guidance. If nausea, appetite loss, or stomach motility issues are affecting your quality of life, discuss medical cannabis with a licensed healthcare provider to weigh potential benefits and risks in your specific situation.