A tendon on the right side of the stomach may be caused by varicose veins and colon tumor. 1. Varicose veins of the abdominal wall: if the blood circulation in the abdomen is not good, resulting in blood stagnation, there may be a tendon on the right side of the stomach, often accompanied by ascites, hepatosplenomegaly, etc., which is more common in cirrhosis, Buchanan’s syndrome and other conditions. 2. Colon tumor: if there is a tumor in the right abdominal intestinal tract, with the growth of the tumor, the intestinal lumen can be filled gradually, and there may be a tendon on the right side of the stomach, which may be accompanied by vomiting, constipation and other symptoms, and it needs to be treated with surgery or chemotherapy according to the stage of the patient’s tumor and the pathologic type. Therefore, patients with a tendon on the right side of the stomach should go to the hospital as soon as possible to find out the cause of the disease, and actively cooperate with doctors for treatment after diagnosis.