The stellate ganglion is a group of nerves located in the neck, close to the cervical spine. It is also referred to as the cervical sympathetic ganglion. The ganglion is responsible for controlling various functions of the head, neck, and upper extremities, including blood flow, temperature regulation, and sweating. A small dosage of local anesthetic medication is injected near the area of the stellate ganglion in the neck during the block. The medication works by blocking the transmission of pain signals through the stellate ganglion, thereby providing relief from pain in the head, neck, chest and upper limbs. The stellate ganglion block is indicated for conditions that have a “sympathetic” component to their pain, such as complex regional pain syndromes, Reynaud’s disease, or peripheral vascular diseases. It is also indicated for patients suffering from post-traumatic stress disorder.