Neuralgia in the left upper abdomen is usually considered to be caused by postherpetic neuralgia, intercostal neuralgia, spinal cord injury and so on. 1. Postherpetic neuralgia: If there is herpes zoster in the left upper abdomen, usually after the herpes on the skin subsides, there will be neuralgia in the left upper abdomen, which is actually postherpetic neuralgia. 2. Intercostal neuralgia: intercostal neuralgia pain is the pain range of the abdominal intercostal nerve course and distribution area, manifested as left upper abdominal neuralgia. 3. Spinal cord injury: spinal cord injury can cause pain in several areas, including the abdomen. Therefore, left upper abdominal neuralgia may also be caused by spinal cord injury. As you can see, neuralgia in the upper left abdomen can be caused by different reasons. Once this symptom occurs, it is recommended that the patient go to a regular hospital as soon as possible to get a clear diagnosis of the cause of the disease and timely treatment.