IL6 and irritable bowel syndrome: IL-6 mRNA expressions in DP-IBS and NDP-IBS patients were significantly higher than those in the control group (0.026 ± 0.004, 0.023 ± 0.005, and 0.017 ± 0.006, resp., F = 53.077, P < 0.01), and DP-IBS patients had a higher IL-6 mRNA level than that of NDP-IBS patients, P < 0.05.