<unk>  is a variant type of migraine. It primarily affects children, and is rare in adults. It mainly causes episodes of<unk>  pain without an accompanying headache. It is poorly understood. It is difficult to confirm the diagnosis, as periumbilical<unk>  pain has an extensive differential diagnosis. It may be treated with analgesia in some patients, and other medications. Avoiding triggers can prevent an episode of<unk> .
Abdominal migraine
Menstrual migraine
Sexual headache
Acephalgic migraine
External compression headache
Cold-stimulus headache
Migraine 
Migraine