In addition, bloating correlated with CgA (r = 0.85, P = 0.03), anorexia correlated with each of secretin (r = −0.91, P = 0.01) and GIP (r = −0.95, P=0.003), and nausea correlated with each of CCK (r= –0.89, P=0.01) and GIP (r= –0.95, P=0.003) in the idiopathic IBS subgroup. Here, CCK is linked to irritable bowel syndrome.