Gastrointestinal dysfunction may cause back pain. 1. Gastrointestinal dysfunction is clinically known as functional bowel disease, which is an abnormality of intestinal-brain interaction caused by a variety of biological, psychological, and social factors, resulting in chronic or recurrent gastrointestinal symptoms without anatomical abnormalities. Gastrointestinal dysfunction includes many types, the common ones are functional dyspepsia, irritable bowel syndrome, functional constipation and so on. 2. Patients with gastrointestinal dysfunction are often accompanied by symptoms such as abdominal distension, abdominal pain, diarrhea, constipation, acid belching, heartburn, and loss of appetite. When acid reflux occurs, stomach acid and other substances may reflux to the esophagus, causing irritation to the esophageal mucosa and pain, which may radiate to the back, resulting in back pain. However, back pain is not a typical symptom of gastrointestinal dysfunction. When patients suffer from long-term or recurrent back pain, it is recommended that they consult a doctor in a timely manner to find out the cause of the disease and follow the doctor’s instructions to carry out targeted treatment in order to avoid delaying the condition.