The neck is made up of cervical vertebrae, and there are seven cervical vertebrae in total. The seventh cervical vertebra is the most obvious one, which can be seen when you look down. The first and second cervical vertebrae are the atlantoaxial vertebrae, which can be responsible for turning the head, so the structure of the first and second cervical vertebrae is not quite the same as the other five vertebrae. These seven bones together form the neck, which is called the cervical spine in anatomical structure. Because of the peculiarities of human physiological structure, it is easier to do certain activities with the head down, such as studying, living and working with the head down, which is more likely to induce cervical spondylosis. Cervical spondylosis is very common in clinical practice, with pain as the main clinical manifestation and dizziness, nausea and numbness in the arms when the symptoms are further aggravated.