Constant vague pain on the left side of the epigastrium without regularity may be caused by trauma, gastric ulcer, pancreatitis and other diseases, and should be promptly consulted to identify the cause of the disease. 1. Trauma: When the patient’s epigastric region is hit by a strong external force, it may lead to subcutaneous bleeding caused by injury to the epigastric muscles and soft tissues. When the subcutaneous bleeding continues, the bleeding stimulus may lead to persistent pain on the left side of the upper abdomen. 2. Gastric ulcer: When ulcer occurs, the ulcer surface and the surrounding tissues may undergo an inflammatory reaction, and the release of inflammatory factors will stimulate the pain, while the stimulation of gastric acid on the ulcer surface will also cause pain in the epigastric region of the patient. 3. Pancreatitis: After inflammation of the pancreas occurs, there may be pain in the left side of the upper abdomen and a feeling of girdle in the waist. There are many reasons for the persistent pain on the left side of the upper abdomen, so it is recommended that the patient consult a doctor in time to clarify the specific cause of the disease and then follow the doctor’s instructions for treatment.