Some parts or organs of the spine may be damaged or involved in the cervical spine. The first cervical vertebra is mainly associated with the head, ears, nose, throat and face. If disorders occur, it is susceptible to headaches, insomnia, vision loss, memory loss, vertigo, hypertension and facial paralysis. The second cervical segment should be associated with the ear, nose, throat, tongue, vocal cords, mouth, etc. If disorders occur, they are prone to dizziness, migraine, tinnitus, chest tightness, tonsillitis, mumps, sinusitis, allergies, loss of voice, etc. The third cervical vertebra is mainly associated with the pharynx, cheek, shoulder, and diaphragm. If disorders occur, it is prone to pharyngitis, foreign body sensation in the throat, toothache, neck and shoulder pain, breathing difficulties, hyperthyroidism, etc. The fourth cervical vertebra is mainly associated with the neck muscles, pharynx and arm. If disorders occur, it is prone to shoulder pain, toothache, trigeminal neuralgia, hyperthyroidism, chest tightness, and erratic reflux (eruption). The fifth cervical vertebra is mainly associated with the elbow, esophagus, trachea, diaphragm, heart, etc. If disorders occur, it is prone to bronchitis, pharyngitis, asthma, arm pain, tachycardia or bradycardia, etc. The sixth cervical segment is mainly associated with the thyroid gland, esophagus, trachea, heart and lungs, and upper limbs. If disorders occur, it is easy to suffer from arm or wrist pain, thyroiditis, hypotension, cardiac arrhythmia, fifty shoulders, soreness and numbness of the thumb, etc. The seventh cervical vertebra is mainly associated with the thyroid gland, esophagus, trachea, heart and lungs, and brachial muscles. If disorders occur, it is prone to thyroiditis, hypotension, cardiac arrhythmia, outer arm, middle finger, humerus, ring finger pain and numbness.