One framework that helps integrate these findings is the Cell Danger Response (CDR), described by Naviaux and colleagues.
The cell danger response is a protective metabolic state that cells enter in response to threat — such as infection, inflammation, or toxic stress. When activated, cells shift priorities away from growth and repair toward defense and survival. Healing cannot fully resume until this response resolves.
In chronic fatigue syndrome and fibromyalgia, research suggests that the cell danger response may remain incompletely shut off, even after the original trigger has passed. When this occurs:
- Energy production is downregulated
- Immune signaling remains heightened
- Pain sensitivity increases
- Normal recovery mechanisms are impaired
For patients, this translates into persistent fatigue, post-exertional crashes, pain, and heightened sensitivity. Importantly, this is a biological survival response, not a psychological failure.