Clinical factors associated with the symptoms of constipation in patients with diabetes mellitus: A multicenter study

Background and Aim Changes in treatment protocols for patients with diabetes mellitus (DM) may influence the functions of the digestive tract. This study examined possible clinical factors associated with the symptoms of constipation in patients with DM. Methods This was a multicenter study. Participants were consecutive Japanese patients undergoing treatment for type 1 or type 2 DM. Constipation was evaluated using the gastrointestinal symptom rating scale. Diabetic neuropathy was evaluated by the presence or absence of peripheral neuropathy of the lower limbs. Results Of 419 participants, 258 were men and 161 women (ratio: 1.6:1), with a mean age of 63.6 ± 12.5 years. In multivariate analysis, symptoms of constipation were significantly associated with age (odds ratio (OR)=1.02, 95% confidence interval (CI): 1.01–1.04, P=0.032), lower mental component summary (OR=3.31, 95% CI: 1.69–6.48, P<0.001), diabetic retinopathy (OR=1.99, 95% CI: 1.14–3.45, P=0.015), and diabetic neuropathy (OR=1.86, 95% CI: 1.10–3.16, P=0.021). In patients with peripheral neuropathy of the lower limbs, regardless of the presence of other complications (diabetic nephropathy, diabetic retinopathy), the prevalence of symptoms of constipation were twice that of patients without peripheral neuropathy (40.0–49.1% vs. 22.0%). Diabetic drugs were not associated with symptoms of constipation. Conclusions Diabetic neuropathy, defined as peripheral neuropathy of the lower limbs, was significantly associated with symptoms of constipation. Peripheral neuropathy of the lower limbs is not a direct risk factor for constipation, but may be a useful criterion when assessing whether constipation is associated with DM. Trial registration UMIN000022994.