The right side of the waist, for example, has a local hematoma due to trauma, which will stimulate the peritoneum and slow down intestinal peristalsis, leading to abdominal distension and abdominal pain. 3. After a stone appears in the right urinary system, the stone goes down the ureter, which will stimulate the wall of the ureter and lead to symptoms of pain in the waist, often causing pain in the right side of the abdomen. Therefore, it is best to go to the hospital after this condition and let the doctor give a relevant examination to further clarify the diagnosis.