This article has as good as any explanation about the development of chronic pain, and how it may be out of proportion to the original injury, with a discussion on how acupuncture can help:
[Acupuncture] can help both to manage and relieve the pain in the short term, and help to address the underlying causes of the pain to help to resolve chronic pain over time.
In my practice, I have seen patients with chronic pain respond very positively to acupuncture, with a reduction in pain symptoms and the overall level of pain. As pain diminishes, acupuncture helps open the door for healing, allowing a person to regain aspects of their former lifestyle and quality of life.
Although chronic pain is a complex problem, acupuncture is a treatment option certainly worth considering!