Objectives: Clinically, patients with dyspepsia often complain of several gastrointestinal (GI) and extra-GI symptoms. However, there have been few studies investigating the relationship between GI symptoms and extra-GI symptoms. The aim of this study was to characterize the clinical features of the 991 outpatients with GI and extra-GI symptom and the relationships between GI and extra-GI symptoms. Methods: 991 patients newly visiting Weedahm Oriental Hospital for GI symptoms were included. Those who had disorders caused by the hepatobiliary-pancreatic system were excluded. The 991 outpatients were interviewed with a standardized questionnaire inquiring about demography, past medical history, past institutional care, GI symptoms and extra-GI symptoms. Results: Among 991 patients, 780 (78.7%) had more than three GI symptoms and 451 (45.5%) had more than five. Among 991 patients, 545 (55.0%) had more than three extra-GI symptoms and 285 (28.8%) had more than five. There was a statistically significant correlation between GI symptoms and extra-GI symptoms such as headache, fatigue, forgetfulness, eyeball pain, unrest, dizziness, muscle pain, chest pain, and dyspnea. Conclusions: We found that there was statistically significant correlation between GI symptoms and extra-GI symptoms, which suggests the possibility of main common pathophysiology between GI symptoms and extra-GI symptoms. Further studies will be required to elucidate the main common pathophysiology between GI symptoms and extra-GI symptoms.