Clinical experience and research suggest that Cyclic Vomiting Syndrome is not a single, uniform condition. Instead, several subgroups have been described based on associated features, triggers, and accompanying medical conditions. These subgroups may help explain the wide variation in symptoms and disease course seen among individuals with CVS.
Commonly Described CVS Subtypes
CVS Plus
CVS Plus refers to cases in which CVS occurs alongside additional neuromuscular or neurological features. These may include cognitive impairment, skeletal muscle weakness, cranial nerve abnormalities, or seizure disorders. Children with CVS Plus often present at a younger age and are more likely to have conditions related to autonomic nervous system dysfunction, such as migraine, chronic fatigue, and other neurovascular symptoms.
Catamenial CVS
Catamenial CVS is characterized by vomiting episodes that are closely linked to the menstrual cycle. In these individuals, hormonal fluctuations appear to play a significant role in triggering episodes.
Sato Variant
The Sato variant of CVS has primarily been described in children and is associated with vomiting episodes accompanied by high blood pressure and mood changes, such as depressive symptoms. During attacks, patients may show temporary metabolic and hormonal abnormalities, including elevated stress hormones and disturbances in fluid and electrolyte balance. These findings suggest a strong involvement of the body’s stress-response systems in this subgroup.
Additional Proposed CVS Subgroups
Other proposed subgroups of CVS include individuals who experience:
CVS associated with migraine
Elevated blood pressure during episodes
Vomiting linked to the menstrual cycle
Co-existing diabetes
Co-existing neuromuscular disorders (CVS Plus)
Severe or prominent anxiety
Nausea and/or vomiting predominantly in the early morning
Onset of CVS following an infectious illness
Clinical Relevance of Subgroups
At present, it is not fully understood whether these CVS subgroups respond differently to specific treatment approaches. However, identifying subgroup features may help guide individualized assessment and management strategies and may contribute to a better understanding of the underlying mechanisms of the disorder.
Comprehensive Information on CVS
- What Is Cyclic Vomiting Syndrome (CVS)?
- Possible Mechanisms Underlying Cyclic Vomiting Syndrome (CVS)
- Subgroups of Cyclic Vomiting Syndrome (CVS)
- CVS Plus: A Distinct Subgroup of Cyclic Vomiting Syndrome
- Cyclic vomiting syndrome and abdominal migraine
- Cyclic Vomiting Syndrome, Mitochondrial Dysfunction, and Treatment
- Cyclic Vomiting Syndrome in Adults
- Adult CVS and Cannabinoid Hyperemesis Syndrome (CHS)
- Management and Treatment of Cyclic Vomiting Syndrome (CVS)