This is characterized by bouts of unexplained vomiting that stop as they came with a symptom free
period and start again. There is
no test to diagnose it yet. Diagnosis is made by a careful history which shows that each vomiting episode was similar to the previous one in terms of pattern, duration and symptoms.
While this may not have triggers but often triggers are found like emotional stress, exams, fights in schools, inability to adjust to one’s environment etc.