Patients with irritable bowel syndrome experience diarrhea immediately after eating, and at this time, it is necessary to further perfect the electronic colonoscopy to exclude the possibility of organic intestinal diseases. If the possibility of organic intestinal diseases has been completely ruled out, it is possible to consider the discretionary use of bidirectional intestinal regulators for treatment, such as the use of trimebutine maleate. It is also necessary to use medications that regulate the intestinal flora for treatment. If necessary, anti-anxiety medications such as fluvoxamine and milnacipran can also be used for treatment. (The use of medications should be under the guidance of a physician.)