Cannabinoid hyperemesis syndrome (CHS) is the cycle of severe, repeated vomiting tied to long-term cannabis use. One of the stranger tools for calming an attack is a cream made from chili peppers. It can genuinely help. It also cannot fix what is driving the attacks.
Does capsaicin cream work for CHS?
For many people, yes, at least as short-term relief. Capsaicin cream, made from the active compound in chili peppers, is rubbed on the abdomen during an attack to calm nausea and vomiting. The best evidence is mixed and low-tier, so treat it as a reasonable option to try, not a proven cure.
Emergency physicians reach for it because it is cheap, sits behind most pharmacy counters, and carries little downside when used correctly. It will not work for everyone, and it does nothing to address why the attacks keep coming. But as a tool to have in your corner during a bad night, it earns its place.
Why would a chili pepper compound stop vomiting?
Capsaicin is thought to work as a TRPV1 agonist, meaning it switches on the same heat-sensing receptor in your skin that a hot shower activates. Many people with CHS already know that near-scalding water calms their symptoms. Capsaicin appears to tap into that same pathway (Dean and colleagues, 2020; systematic review, 2024).
The hot-shower habit is one of the clearest fingerprints of CHS. Researchers believe long-term cannabis use throws off the body's normal signaling, and that heat, whether from water or from capsaicin, briefly resets part of that circuit. This is the leading explanation, not settled science, but it lines up with what patients report and with how the cream is used at the bedside.
What did the new 2026 study find?
A 2026 emergency-department study followed patients treated with topical capsaicin. Their abdominal pain dropped from a median of 8 to 2 on a 10-point scale, and vomiting stopped in about half of them (Gresnigt and colleagues, 2026). It is encouraging, but it was an observational study, not a randomized trial.
That is a meaningful drop, and it is the largest recent look at capsaicin used the way people actually use it, in real emergency visits rather than a controlled lab. The catch is in the design. Patients were observed rather than randomly assigned to capsaicin or a dummy cream. So some of the improvement may have come from time, fluids, other medications, or the simple fact that attacks eventually pass. Read it as more supportive evidence, not proof.
How strong is the evidence, really?
Weaker than anyone would like, and honest sources say so. The only published randomized trial, in 30 patients, showed a benefit at 60 minutes but missed its main 30-minute mark (Dean and colleagues, 2020). A 2024 systematic review called the overall evidence mixed and asked for more rigorous trials (GRACE systematic review, 2024).
So the picture is a small positive trial that did not fully hit its target, a review that stops short of endorsement, and now a larger but observational 2026 study pointing the same direction. That is a low-tier, mixed body of evidence that leans supportive. It is enough to make capsaicin worth trying. It is not enough to call it proven or first-line.
How do you use capsaicin cream safely?
Apply a thin layer to your abdomen at the start of an attack, use a low-strength cream, and wash your hands well afterward. The most important rule is to keep it away from your eyes, genitals, and any mucous membranes, where it causes intense burning. Test a small patch of skin first.
Over-the-counter creams in the 0.025 to 0.075 percent range are the usual starting point. Do not apply it to broken skin, and do not stack it with a heating pad on the same spot, since both drive the burning sensation and you can overdo it. Keep it away from children unless a clinician tells you otherwise.
What to do
If you think capsaicin might help you through an attack, here is a sensible order of operations that keeps both safety and the real fix in view.
- Confirm the diagnosis. Cyclic vomiting, relief from hot showers, and long-term cannabis use is the classic pattern, but have a clinician rule out other causes first.
- Keep a low-strength capsaicin cream on hand, and apply a thin layer to your abdomen at the first sign of an attack, well away from your eyes and mucous membranes.
- Pair it with the basics during an attack: small sips of fluid, rest, and any anti-nausea medication your clinician has recommended.
- Get real support for cannabis cessation, because that is the only step that ends the cycle. Ask your clinician about the options that fit you.
- Know your red flags. If you cannot keep any fluids down, show signs of dehydration, or have severe or unusual abdominal pain, stop managing it at home and get to an emergency room.
Capsaicin can carry you through the worst hours of an attack. Stopping cannabis is what carries you out.