It is not usually necessary to hold urine for an appendiceal ultrasound. If the physician suspects that an ectopic appendix may be present, the patient may be asked to hold urine, which is more helpful in finding the appendix in a larger area of the pelvis. The images may also be displayed more clearly because of the help of the bladder transillumination window. The appendix is usually looked for at the blinded end of the gyrus, and the normal appendix has an outer diameter of no more than 6 mm; if it is more than 6 mm, there should be a suspicion that the appendix may have inflammatory changes. In addition, the echogenicity of the appendiceal wall, the presence of fecal stones in the appendiceal lumen, and the accumulation of pus in the canal lumen should be specifically observed. Sometimes appendicitis should also be diagnosed when a normal appendix cannot be found on ultrasound, but an echogenic mass or an abnormally thickened ductal lumen-like structure with flocculent or fecal stone like echogenicity can be seen in the appendiceal region. Therefore, the diagnosis of appendicitis should be made in conjunction with the size of its outer diameter, but also in conjunction with the echogenicity. In addition, when examining the appendix, there is a possibility that there is no problem with the appendix within the observation range or that the appendix is not observed. Therefore, for the examination of the appendix, in addition to the changes on the sonogram, it must be closely combined with the clinical manifestations, such as the patient’s physical signs and clinical laboratory indicators such as blood tests.