In the head and neck area, many organs are gathered into a very compact space, making the anatomy in this area is very complicated. A wide variety of diseases and lesions may occur in this area. During a head and neck ultrasound examination, we must detect lesions concerning the anatomy. Ultrasonography has many advantages over other diagnostic imaging modalities. It is a noninvasive and radiation-free investigation, and it does not require troublesome pretreatment or preparations. Moreover, it allows for the possibility of real-time dynamic assessment without interference from dental metal, and it can also provide accurate guidance for interventional procedures. Previously, in the head and neck area, only the thyroid gland or salivary gland was independently investigated by ultrasonography with limited movement of the probe, but recent advances in ultrasonography, especially improvements in close-range spatial resolution and the development of small linear probes, have made it possible to scan the whole neck as one area. To scan the whole neck completely and to assess the findings, practice and learning are necessary to some degree, such as knowledge about the anatomy and diseases, and techniques to overcome the irregular surface made by submandibular bone, clavicle bones, and thyroid cartilage. Trying to record the most suitable image for diagnosis is important for the reproducibility and reliability of ultrasonography.