Other chronic pains include Arthritis, Migraine, Fibromyalgia, Scars, Post Thrombotic Syndrome and all types of Old injuries. These are all messages of pain that no longer serve a purpose, therefore are quite safe to delete and remove.
Additionally to this, and often overlooked, there is emotional chronic pain, including anxiety, depression, guilt, stress etc.
Emotional and Physical Pain share the same pathways in the brain, and can often transfer or overlap. For example, anxiety may sometimes represent as neck or shoulder pain.