CHS Symptoms: The Full Checklist (2026)

Written by the CHS SOS Team · Medically reviewed, sources cited throughout · Last updated: July 2026

TL;DR — Key Takeaways

• CHS produces a specific, repeating set of physical symptoms that follow a predictable pattern across nearly every patient.
• The defining triad: cyclical vomiting, cramping abdominal pain centered around the navel, and compulsive hot bathing.
• Several less-discussed symptoms, sweating, flushing, electrolyte-related muscle cramps, round out the clinical picture.
• Feeling completely normal between episodes is itself a symptom, and one of the most diagnostically significant.
• Inability to keep fluids down for more than 6 to 8 hours is the threshold for seeking emergency care.

A CHS episode has a physical signature. It is not just vomiting. It is a specific combination of symptoms that arrive together, behave in a particular way, and then disappear, leaving the person feeling genuinely fine until the next episode. For the complete overview of the condition, see our complete guide to CHS; this page is the full symptom breakdown.

The defining triad

Cyclical, severe nausea

The nausea in CHS is not the background discomfort of motion sickness or the mild queasiness that shows up with anxiety. It builds. It keeps building. And it does not resolve with the usual remedies. What makes it clinically distinct is its cyclical nature: it arrives as part of an episode, peaks over 24 to 48 hours, and then stops. That oscillation between acute distress and full normalcy is the feature that most consistently sets CHS apart from other gastrointestinal conditions.

Repeated vomiting, often resistant to standard medication

During a full episode, vomiting is frequent, sometimes multiple times per hour, and tends to be triggered by eating or drinking anything. One consistent clinical observation: antiemetics that work well for other types of nausea often underperform in CHS. Haloperidol has shown better results in emergency settings, which is part of why it is increasingly used as a first-line option when CHS is suspected.

Abdominal cramping around the navel

Pain localized around the navel accompanies the vomiting in most episodes. What is notable is that this pain does not show up on standard imaging or scope exams. CT scans, ultrasounds, and endoscopies come back clean, which is one reason CHS takes so long to diagnose.

Compulsive hot bathing

The pull toward very hot showers or baths during an episode is one of the most recognized features of CHS. Most patients discover it on their own, before they have any idea what they are dealing with, because it works. Why this happens physiologically is covered in our article on what causes CHS. This behavior is specific enough to CHS that clinicians treat it as a diagnostic marker.

Symptoms that get less attention

• Excessive sweating during episodes, beyond what vomiting alone would cause.
• Skin flushing. Redness or warmth, particularly noticeable during or after hot water exposure.
• Unusual thirst between vomiting bouts.
• Restlessness and agitation during episodes, an inability to stay still.
• Muscle cramping in severe or prolonged episodes, from electrolyte depletion. This is the point where a hospital visit becomes medically necessary.
• Significant weight loss across multiple episodes, often 5 to 15 pounds over a year of repeated episodes.

How symptoms shift across the episode cycle

• Early prodromal: mild morning nausea that fades by midday, vague stomach discomfort, hot showers start feeling unusually good.
• Late prodromal: nausea more frequent and persistent, isolated vomiting incidents weeks apart, growing reluctance to eat in the morning.
• Hyperemetic (acute): severe nausea, repeated vomiting, navel-centered cramping, hot shower compulsion fully established. Lasts 24 to 48 hours.
• Recovery: symptoms stop, often abruptly. Appetite and energy return.
• Inter-episode baseline: no symptoms at all. This full return to normal is one of the most diagnostically important features of CHS.

You can read more about that earliest stage in our guide to the first signs of CHS, and how to tell CHS apart from ordinary nausea in CHS vs normal nausea.

When symptoms require emergency care

• Inability to keep any fluids down for more than 6 to 8 continuous hours
• Signs of dehydration: dark or absent urine, dizziness when standing, dry mouth, confusion
• Abdominal pain that is worsening rather than holding steady
• Muscle weakness or cramping suggesting electrolyte depletion
• A first episode, or one that has now passed the 48-hour mark without improvement

Frequently Asked Questions

Can CHS cause chest pain?

Chest pain is not a primary CHS symptom. Forceful, repeated vomiting can strain chest and esophageal muscles, producing secondary discomfort. Severe or persistent chest pain should be evaluated by a doctor.

Do CHS symptoms get worse over time with continued cannabis use?

Yes, in most documented cases. The receptor changes that underlie CHS tend to deepen with ongoing use, and episodes typically become both more frequent and more severe.

Is the nausea constant throughout an episode, or does it come in waves?

Within a single episode, nausea tends to be fairly constant and severe, with vomiting occurring in waves. Hot water provides temporary breaks, but the underlying nausea remains until the episode runs its course.

Can CHS cause fever?

Fever is not a recognized CHS symptom. If vomiting is accompanied by significant fever, another cause should be ruled out.

Think you might have CHS?

If this pattern matches your experience, CHS SOS can help you understand what you are dealing with and what to do next.