Rebound pain in the lower abdomen is most often seen when intra-abdominal organ lesions involve the adjacent peritoneum and also in primary peritonitis. Rebound pain is a sign of inflammatory involvement of the peritoneal wall and is most often seen in cases of intra-abdominal organ disease involving the adjacent peritoneum and primary peritonitis. So, what are the tests that need to be done for patients with lower abdominal rebound pain? The following is a brief introduction: 1, magnetic resonance imaging (MRI), MRI is a new high-tech imaging examination method in recent years, is a new medical imaging diagnostic technology applied to the clinic only in the early 80s. It has the unique advantages of no ionizing radiological (radiation) damage; no bony artifacts; capable of multi-directional (transverse, coronal, sagittal sections, etc.) and multi-parametric imaging; high soft tissue resolution; and can display vascular structures without the use of contrast agents. 2.Abdominal vascular ultrasonography and abdominal vascular ultrasonography for abdominal aortic aneurysm can measure the anterior-posterior diameter, long diameter and wide diameter of the aneurysm, which can be the preferred method for entrapped abdominal aortic aneurysm. Abdominal ultrasound is of great value in the diagnosis and differential diagnosis of obstructive diseases of the inferior vena cava as well as the judgment of treatment effect. 3, abdominal shape palpation, abdominal shape palpation is an auxiliary examination method used to check whether the abdomen is normal pressure pain and rebound pain, organ palpation. The content of abdominal palpation mainly includes abdominal wall tension, the presence of pressure pain and rebound pain, abdominal mass, fluid wave tremor and liver and spleen and other intra-abdominal organs.