Chronic pain is not a single entity but varies in origin and characteristics. It may have been caused by an initial injury—a sprained back, whiplash, or sports injury—or some organic disorder—arthritis, cancer, or ear infection.
Chronic pain is not a single entity but varies in origin and characteristics. It may have been caused by an initial injury—a sprained back, whiplash, or sports injury—or some organic disorder—arthritis, cancer, or ear infection.