The pulsation of the abdominal aorta is not palpable in the general population and can only be felt in two cases. First, the patient is thin, in which case the pulsation of the abdominal aorta can be palpated because the abdominal organ contents are less, which will make the pulsation of the abdominal aorta conductive to the abdominal wall. Second, abdominal aortic aneurysm, due to the expansion of blood vessels caused by the compression of the surrounding tissue, so that the expansion of the abdominal aorta can be found in the abdominal wall, this situation is very dangerous, because the expansion of the abdominal aortic aneurysm may rupture at any time, bleeding, this bleeding is often caused by a rapid drop in blood pressure, resulting in the death of the patient, so once the abdominal aorta can be found fluctuations in the case, must be ultrasound and angiography Therefore, if fluctuations in the abdominal aorta can be detected, ultrasound and angiography must be performed to confirm the diagnosis.