Vague pain in the right side of the stomach is commonly caused by the following reasons: First, diseases of the hepatobiliary system, such as hepatitis, cirrhosis, liver tumors, cholecystitis, gallbladder stones, gallbladder cancer, bile duct cancer, etc., will cause vague pain in the right upper abdomen. Second, gastrointestinal dysfunction, patients will have vague pain around the umbilicus on the right side, often accompanied by abdominal distension, and even nausea and belching. Thirdly, if diseases occur in the right side of the colon, such as colitis, colon tumor, etc., in addition to pain, diarrhea and blood in the stool will also occur. Fourth, diseases of the appendix, such as appendicitis, appendiceal tumor, etc. Fifth, diseases of the right adnexa, such as adnexitis, adnexal tumor, etc. Patients are advised to go to the hospital in a timely manner and need to improve the relevant tests, such as blood routine, urine routine, stool routine, ultrasound, colonoscopy, etc., so as to clarify the cause, and then the corresponding treatment can be carried out.