This study will enroll 171 men and women experiencing IBS with diarrhea (IBS-D) defined by the ROME III criteria. Subjects will be randomized (by chance) to one of three experimental intervention conditions: Condition 1,subjects receive Standard Acu/Moxa; Condition 2, subjects receive Individualized Acu/Moxa and Condition 3, subjects receive Sham Acupuncture/Placebo Moxibustion(control group).