If the patient has back pain and has gastrointestinal symptoms such as regurgitation and nausea, the possible causes are as follows: 1. caused by too intense pain, when the pain is very intense, the body’s gastric acid will be secreted in large quantities, which will cause erosion of the gastric mucosa and very easily cause symptoms of nausea and regurgitation, and in severe cases, it can even cause stress ulcers and lead to upper gastrointestinal bleeding. 2. may be caused by back pain The back pain may be caused by stimulation of the vegetative nerves in front of the spine, for example, if the lumbar spine has overly intense osteophytes or herniated discs, when the aforementioned vegetative nerves are stimulated forward, it may cause a series of gastrointestinal symptoms such as regurgitation, nausea, and even constipation and diarrhea. It is possible to show back pain and have regurgitation and nausea at the same time.