Currently, special attention is drawn to the phenomenon of comorbidity of chronic non-infectious diseases. The emergence of comorbidity is facilitated by the high incidence of coexisting diseases. One such combination is GERD and metabolic syndrome (MS). GERD and MS are multifactorial diseases, the pathogenesis of which is intertwined and mutually aggravates each other. Every year throughout the world and the Russian Federation, there is a clear trend towards an increase in the incidence of pathology of the upper gastrointestinal tract, namely gastroesophageal reflux disease (GERD). The prevalence of obesity in Russia over 40 years of observation has increased 4 times among men and 1.5 times among women. Despite the high incidence, to date there is no diagnosis of “metabolic syndrome” (MS) in ICD-10. MS is coded based on its constituent pathologies (obesity, dyslipidemia, insulin resistance, arterial hypertension). Treatment of this comorbid pathology requires a multidisciplinary approach, thereby placing a high burden on the healthcare system. This article displays the features of the pathogenesis and clinical picture of GERD, as well as the combination of this pathology with the components of MS.