How does cold laser therapy treat chronic pain?

Supposedly: Supposedly by increasing heat which increases circulation which increases and/or promotes healing.

Debateable: Cold lasers are handheld devices used by the clinician and are often the size of a flashlight. When cells absorb this light energy, it initiates a series of events in the cell that is theorized to eventually result in normalizing damaged or injured tissue, a reduction in pain, inflammation, edema and an overall reduction in healing time by increasing intracellular metabolism.