Chronic nonmalignant pain is pain defined as an “unpleasant sensory and emotional experience associated with actual or potential tissue damage” lasting either (1) 3 months or longer or (2) longer than expected given a certain injury. It can result from trauma, a disease process, or an unknown cause.By adding the word “neuropathic” to the disorder name, the definition includes that the cause of pain is a direct result of damage or compression of a nerve. Read more here.