The lumbar sympathetic ganglion block (1) is applied anatomically to the lumbar sympathetic ganglion, which is located on the anterolateral side of the vertebral body of the spine, generally with four on each side, and is connected to the lumbar sympathetic trunk by intersegmental branches, superiorly to the thoracic sympathetic trunk; inferiorly between the anterolateral side of the lumbar vertebral body and the psoas major muscle, and connected to the pelvic sympathetic trunk via the posterior aspect of the common iliac vessels into the pelvis; the right side is located lateral to or partially covered by the inferior vena cava; the left side is located in the abdominal aorta The left side is located lateral to the abdominal aorta. It is closer to the median line than the sympathetic trunk of the thorax. The branches are: 1. lumbar nerve, which is connected by the gray traffic branch and distributed with the lumbar plexus nerve 2. lumbar visceral nerve, which passes through the preganglionic fibers of the lumbar sympathetic ganglion. The paravertebral nodes of lumbar 1~2 join the abdominal aortic plexus and end at the inferior mesenteric ganglion, where the converted neurons send out postganglionic fibers that climb the inferior mesenteric artery and are distributed. The paravertebral nodes of lumbar 3~4 join the inferior epigastric plexus, and the ganglion here converts to a neuron, and the postganglionic fibers are distributed to the alimentary canal and pelvic organs below the left curvature of the colon, and there are fibers with blood vessels distributed to the lower extremities. (2) Operation technique Lumbar sympathetic ganglion block operation technique should be performed under the guidance of image monitor. Body surface positioning: the patient is placed in the upward lateral position on the puncture side, and the superior margin of the corresponding puncture spine is determined, with a 6~8 cm opening next to the median line for a local anesthetic mound and infiltration layer by layer. A 12-cm-long, 7-gauge puncture needle is inserted at an angle of 60 degrees to the skin and directed toward the midline of the spine. Advancing about 3~4 cm, the tip of the needle may touch the transverse process of the lumbar 1 vertebral body, or advancing 6~7 cm the tip of the needle touches the lateral edge of the vertebral body. The position of the puncture needle is shown by the image monitor, and the direction and depth of the puncture needle advancement are again adjusted until it is confirmed that the needle tip touches the sympathetic ganglion of the anterolateral aspect of the vertebral body without looking for foreign sensation. Injection of contrast agent was seen to show a linear distribution of images next to the vertebral body, which did not move with the abdominal organs. The air resistance disappearance test for injection is positive, there is no blood and no cerebrospinal fluid in the retraction, and the patient can feel a feverish sensation in the abdominal cavity when 8~10ml of local anesthetic is injected. After the injection of the drug, the affected side is taken to the upward lateral position in order to make the drug dip to the location where the lumbar sympathetic ganglion is located. If the patient requires long-term treatment by this method, after successful puncture, an extra-membranous catheter is placed and continuous lumbar sympathetic block can be performed. (3) Indications for pain-based disorders including renal colic, sympathetic neuropathic pain (SMP) such as burning neuralgia, phantom limb pain, etc. It is used to treat vasospastic diseases such as Raynaud’s disease; thrombo-occlusive vasculitis (Buerger’s), diabetic peripheral neuralgia, ischemic necrosis, lower limb ulcers, post-frostbite pain, etc. It is also used to dilate blood vessels in the lower extremities, increase peripheral flow, promote peripheral venous reflux, and improve lower extremity edema. Injections of nerve-destroying drugs can treat malignant or cancerous sympathetic neuralgia. (4) Complications and their prevention and control Mis-pricking into the subarachnoid space and epidural cavity causes extensive blockage after drug injection and leads to respiratory and circulatory disorders. Repeated punctures can cause neuralgia due to nerve damage; there is also a chance of damaging large blood vessels or puncturing lumbar intervertebral discs, so extra care should be taken during surgery. Although the injected medication is effective, attention should be paid to the possible drop in blood pressure.