Irritable bowel syndrome (IBS) is a functional gastrointestinal disorder in which the main symptoms are abdominal pain or discomfort and changes in bowel habits. The prevalence of IBS is 15-20% in Western countries and 5-10% in the domestic population. Since there is no clear etiology and pathogenesis of the disease, and there is no effective means of treatment, clinical treatment is only symptomatic to relieve patients’ symptoms, so the disease not only seriously affects patients’ quality of life, but also consumes a lot of medical resources. Current studies have shown that IBS is associated with many factors such as diet, psychiatric, enhanced intestinal sensitivity, abnormal gastrointestinal dynamics and dysbiosis of intestinal flora. The aim of this study was to clarify the role of dietary habits in the development of IBS by analyzing the correlation between dietary habits and IBS. IBS is a common clinical functional gastrointestinal disease, the incidence of which has gradually increased in recent years, and the pathogenesis is complex, and there is no specific treatment method. Although the pathogenesis of IBS is complex, the role of dietary factors in the pathogenesis of IBS has been gradually recognized by the academic community, and it has been reported that up to 67% of IBS patients can develop symptoms or worsen symptoms after meals. It has been found that eating inappropriate foods can trigger or worsen the symptoms of IBS patients. Wang Weida et al. also reported a relationship between the onset of symptoms of IBS and diet. With the improvement of living standards, the dietary habits of the national population are also changing, which may be related to the increased incidence of IBS in China reported in recent years. In this study, we found a close relationship between dietary habits and the occurrence of IBS by comparing the dietary habits of IBS patients with those of healthy volunteers. In this study, it was found that the difference in the rate of those with a history of food allergy between the observation group and the control group was statistically significant. Food allergy is mainly due to a local or systemic allergic reaction mediated by LgG or LgE in the body induced by a component of the food consumed by the patient. Although a close relationship between diet and the development of IBS is considered to exist, less research has been done on this close relationship and especially on its mechanism of action. intolerance to one or more foods in IBS patients may be the underlying cause of food-induced IBS.