1.6.1.1 Cyclic vomiting syndrome

Identification: Male patient, 12 years old, previously healthy.

Clinical History: The patient presents with recurrent episodes of intense vomiting, lasting 12 to 24 hours, since the age of 8. The episodes occur approximately every 2-3 months, without a clear trigger. During the episodes, the patient experiences intense nausea, frequent vomiting (up to 10 times per hour), diffuse abdominal pain, pallor, and prostration. There is no fever, diarrhea, or signs of infection. After the episode ends, the patient returns to baseline, without residual symptoms.

Family History: The mother reports a history of migraine in childhood and adolescence.

Complementary Exams: Complete blood count, electrolytes, liver and renal function: normal. Upper gastrointestinal endoscopy: unremarkable. Cranial MRI: normal. Food intolerance test: negative.