ABSTRACT
Objective: To identify the prevalence of physiologic causes of idiopathic constipation in Thai patients.
Patients and Methods: We investigated 103 consecutive Thai patients (29M, 74F, age 50 ±20) with chronic idiopathic constipation (symptom duration; median 5yr, range 0.25-45 yr) as defined by Rome II criteria using colonic transit test, anorectal manometry, and balloon expulsion tests. Constipation symptoms were evalu-ated by a questionnaire.