Wiktionary
abdominal migraine
n. (context pathology English) A variant of migraine in which the pain occurs in the stomach rather than the head.
Wikipedia
Abdominal migraine
Abdominal migraine is a disorder primarily of children which presents with episodes of abdominal pain without an accompanying headache. It is difficult to confirm the diagnosis as there are not a set of features that is specific and thus it can take time before the diagnosis is made. The condition is rare in adults.