Unexplained Vomiting Keeps Happening? You Might Have Cyclic Vomiting Syndrome

The insight from Donguibogam that mental distress affects the physical body aligns closely with modern research on the brain-gut axis. Cyclic vomiting syndrome (CVS), characterized by recurrent episodes of unexplained vomiting, serves as a primary example of disrupted communication along this axis. CVS can occur even in individuals who appear healthy. It is marked by a cycle of acute episodes—during which severe nausea, vomiting, and abdominal pain persist for hours to days before resolving—alternating with symptom-free, asymptomatic intervals. Reported triggers for these episodes include stress, anxiety, exhaustion, specific foods, and infections. The brain and the gastrointestinal tract maintain constant bidirectional communication through the autonomic nervous system, hormones, neurotransmitters, and the immune system. During stress or emotional strain, the brain alters its output of stress hormones such as cortisol and neurotransmitters like serotonin and dopamine. As these signals travel to the gut via the vagus nerve, gastrointestinal motility can increase abnormally or the stomach may become hypersensitive to food, stimulating the vomiting center. Furthermore, CVS is often linked to underlying genetic factors, including mitochondrial dysfunction and specific genetic mutations. Similar to patients with migraines, certain brain areas react hypersensitively to stimuli and provoke digestive symptoms, leading some clinicians to refer to CVS as abdominal migraine. Because routine testing reveals no structural damage, the condition is often dismissed as purely stress-related. However, CVS is a recognized medical disorder rooted in complex dysregulation between the brain and gut, causing genuine physical distress.