A stellate ganglion block is a subcervical ganglion of the sympathetic ganglion in the neck that is irregularly shaped. Clinicians can use a stellate ganglion block to treat a number of conditions by surgically injecting local anesthetics and other drugs into the ganglion and surrounding tissues. This type of block was first discovered during a surgical error in which two surgeons mistakenly injured the sympathetic nerve while ligating the vertebral artery during surgery, but instead obtained significant therapeutic results, and later invented the stellate nerve block. This block can be used to treat systemic diseases and to maintain the stability of the body’s internal environment. It can be used to treat primary hypertension, hypotension, hypothyroidism, hyperthyroidism, postherpetic neuralgia, and post-diabetic vegetative nerve disorders that are difficult to control with drugs, as well as facial paralysis, eye diseases, neck and shoulder pain, cardiac function disorders, and myocardial infarction.