There are many possible causes of pain inside the neck, and the common ones are as follows: 1. There may be neck-related injuries. For example, the neck in the process of excessive activity or direct impact, may produce some muscle, tendon strains or fractures and other injuries, then there will be pain inside the neck. 2, may be due to the degeneration of the cervical spine caused. For example, when a patient has cervical spondylosis, there may be pain inside the neck. 3. This condition may be caused by muscle spasm in the neck. For example, if the patient fixes the neck in a certain position for a long time, it may lead to spasm of the muscles of the neck, such as the sternocleidomastoid muscle and the cervical pinch muscle, which may lead to pain. 4. This condition may be caused by the lesion of some glands in the neck. For example, goiter, thyroid cancer or enlarged lymph nodes in the thyroid gland may cause such symptoms. 5. This condition may be caused by some vascular lesions in the neck. For example, inflammation or atherosclerotic plaques inside the large blood vessels in the neck may also cause similar symptoms. Finally, this symptom may also be caused by throat or heart-related lesions.