Neuralgia has more causes and is pain caused by damage or potential damage to the localized tissues of the nerves in the area of pain. Neuralgia is a neuropathy that originates in the course of the conduction pathways of the nervous system. For example, dermal nerves, or afferent nerves along the nerve conduction pathways, the dorsal root ganglia of the spinal cord, the spinal cord upward conduction tracts, and transmission to the center of the brain, all of which produce neuralgia when there is a lesion of localized tissue of the nerves in these conduction systems. There are many causes of neuralgia, including intervertebral discs, inflammation, destruction of tissues, such as cancerous tissues directly destroying nerve tissues or surrounding tissues, bone tissues or other soft tissues, visceral tissues, or metabolic endocrine disorders, or metabolic waste production. There may also be poisoning, chemical substances that directly damage the nerves, and so on. There are many causes of neuralgia, and there are many parts of the nerves that can become diseased, and neuralgia can occur when any part of the nerve conduction pathway is damaged.