Appendicitis is usually an acute condition and is often billed to the emergency department for examination. It can be billed as general surgery or internal medicine. Ultrasound is one of the most simple, intuitive, fast, and primary methods of examination for appendicitis. The appendix is swollen and edematous at the onset of appendicitis, and the boundaries of the appendix are not clear. These are the characteristics of ultrasound diagnosis of appendicitis.