Chronic pain is reclassified in ICD11. Under this new classification, chronic pain is defined as ‘pain that persists or recurs more than 3 months,’ as it has been previously. The classification goes even further to differentiate types of pain. Pain can the sole or a leading complaint, needing special treatment and care.
Other subgroups specify that pain may be secondary to an underlying disease. For instance, there can be chronic cancer for berelated pain, chronic neuropathic pain, chronic secondary visceral pain, and chronic secondary headache and orofacial pain, to name a few categories