Involvement of the cervical sympathetic chain can be examined on the basis of clinical symptoms, manifested by the fibers emanating from the upper, middle and lower cervical sympathetic ganglia and the thoracic 2 to 5 sympathetic ganglia that form the cardiac plexus, and so cervical spondylosis can cause cardiac arrhythmias in some cases. If there is simultaneous cervical 2 to thoracic 5 involvement of the sympathetic ganglia, it can cause symptoms similar to angina pectoris in coronary artery disease. Cervical sympathetic chain involvement can cause three types of reflex sympathetic dystrophy manifestations in the upper extremities. Most of these cases do not have segmental radicular pain. When the cervical 5 or cervical 6 nerve root is stimulated, it manifests as pain in the shoulder joint and periarticular area, which may develop into shoulder arthritis and periarticular arthritis, or even shoulder atrophy. If there is simultaneous stimulation of the cervical 5-7 sympathetic nerves, then shoulder-hand syndrome will appear. What are the examination methods? 1.Neck MRI examination Neck MRI examination is MRI scanning of the neck and neck periphery, which is used to diagnose lesions in the neck. 2.CT examination of bone joint and soft tissue CT examination of bone joint and soft tissue is a method to examine bone joint and soft tissue through CT. It mainly focuses on injuries and diseases of bone joints and soft tissues. It is suitable for patients with bone joint and soft tissue diseases. 3.Histamine test Histamine test Histamine test is a test to determine the function of unperipheral nerves. Histamine can excite the sympathetic nerve, prompt the release of catecholamines stored in the nerve endings, contract the peripheral blood vessels, and increase the blood pressure. In patients with pheochromocytoma, the catecholamine reserve in the sympathetic nerve endings is more than normal, and the release of catecholamine after injection of histamine is also more than normal. For suspected pheochromocytoma, exogenous histamine should be injected in the interictal period to trigger the hypertensive attack, and the degree of blood pressure elevation and the presence of clinical symptoms should be observed to assist the diagnosis. Vertical hair reflex The vertical hair muscle is innervated by sympathetic nerves. Place ice cubes on the back of the neck or armpit of the patient, after a few seconds, the erector spinae muscle can be seen to contract, and the follicles of the hair bulge like chicken skin. Judge the scope of sympathetic nerve dysfunction according to the site of erectile reflex disorder.