The prevalence and clinical characteristics of primary headache in irritable bowel syndrome: a subgroup of the functional somatic syndromes.

Context: The irritable bowel syndrome and primary headache are two chronic diseases characterized by symptoms of recurring pain and affect approximately 10%-20% of the general population.

Objectives: To study the prevalence of primary headache in volunteers with irritable bowel syndrome in a Brazilian urban community.

Methods: It was evaluated the prevalence of primary headache associated with irritable bowel syndrome in adult volunteers 330 no patients.