Under normal circumstances, due to the continuation of the abdominal aorta in the abdomen, the pulsation of the artery can be palpated when lying down, causing the patient to feel the stomach beating all the time; the beating of the abdomen may also be obviously felt in women with a thin body type during pregnancy. In addition, the stomach has been jumping may also be related to external stimuli and pathological factors: a. External stimuli: such as abdominal cold, external impact, etc., stimulate the abdominal muscle tissue, thus causing reflex contraction of abdominal muscles, causing spasm, the performance of the stomach has been jumping. The tumors with rich blood supply, such as abdominal active tumor and gastrointestinal polyps, may stimulate or compress the surrounding tissues, resulting in the tummy jumping. Tumors with rich blood supply, such as abdominal aortic aneurysm, may also cause the tummy to jump all the time.