If you have an injury or a painful tissue that simply will not heal no matter what you try, there may be a reason at the level of your cells. Inside each cell is a manufacturing center called the endoplasmic reticulum that, when overwhelmed, triggers a massive, resource-draining emergency response — and while that emergency runs, the cell diverts everything away from repair just to survive. This article, part of our Hidden Drivers of Chronic Pain series, explains why so many tissues stay frozen in a state of non-repair.
The endoplasmic reticulum and its partnership with mitochondria
The endoplasmic reticulum, or ER, is a sprawling network inside your cells. It is a major manufacturing center — especially for folding proteins into their correct shapes — and a key hub for calcium signaling. Importantly, the ER and your mitochondria are physically tethered together. They are partners, constantly exchanging signals and calcium, so they function as a closely linked unit. When one partner is in trouble, the other feels it, and that connection is central to what goes wrong here.
The unfolded protein response (UPR)
When mitochondrial function is compromised, calcium handling gets disrupted. Because the mitochondria and ER manage calcium together, the ER senses this imbalance, and the resulting buildup of improperly folded proteins sounds an alarm. It initiates the unfolded protein response, or UPR — a massive, energy-intensive, cell-wide stress response whose job is to restore order by pausing normal production, clearing the backlog, and dealing with the crisis. In the short term it is protective, but it is expensive, and it commandeers the cell’s resources. While the UPR is running, the cell is in emergency triage, pouring energy into survival rather than its normal work.
Why stressed cells can't repair tissue
Chronic pain patients are often in a state of constant, ongoing ER stress. The UPR is not a brief emergency that resolves but a persistent background alarm. And while that alarm keeps running, the cell’s resources are continuously diverted away from tissue repair. The result is tissue that is effectively stuck in a state of non-repair — it cannot get on with healing because its cells are perpetually occupied with their own internal emergency. This helps explain a pattern seen again and again: tissues that simply will not heal and seem frozen despite everything. At the cellular level, they are too stressed to repair.
A more compassionate picture of tissue that won't heal
The science of ER stress and the unfolded protein response is well established and is a major field of research. The physical and functional coupling of mitochondria and the ER, and the disruption of calcium handling, are understood, and ER stress is increasingly implicated in metabolic disease, neurodegeneration, and chronic pain conditions. So if a painful tissue will not heal, here is a more accurate picture: your cells have not given up — they are stuck in survival mode, pouring resources into managing an internal crisis with nothing left for repair. It is not refusal and it is not failure. It is triage.
How the Padda Institute approaches non-healing tissue
The approach is to reduce the chronic cellular stress that keeps your tissues locked in non-repair. Because ER stress is downstream of mitochondrial dysfunction, that means building the full foundation discussed across this series: restoring mitochondrial health, calming inflammation, and stabilizing the metabolic environment to lower the constant ER stress. As that emergency response stands down, cells can redirect their resources from survival back to repair. In this practice-based framework, regenerative therapies are described as more effective once cells are no longer stuck in crisis mode — the idea of fixing the biological soil first. Individual results vary.
Frequently asked questions
What is endoplasmic reticulum (ER) stress?
ER stress is a cell-wide emergency triggered when the endoplasmic reticulum — the cell's protein-folding and calcium-signaling center — is overwhelmed. It sets off the unfolded protein response (UPR), a costly stress response that pauses normal work so the cell can survive the crisis. When it runs constantly, the cell has little left for tissue repair.
Why won't my injured tissue heal?
According to the mechanism described in this video, cells stuck in ongoing ER stress divert their resources into survival rather than repair, leaving tissue frozen in a state of non-repair. It is not that your body has given up; the cells are occupied with an internal emergency. Resolving the underlying stress is what lets repair resume, and individual results vary.
Should I change my medications or supplements to reduce cellular stress?
The approach described focuses on restoring mitochondrial health, calming inflammation, and stabilizing the metabolic environment rather than on any single product. Do not start, stop, or change any medication without consulting your physician. Individual results vary.
Where are you located and how do I book?
Padda Institute Center for Interventional Pain Management, 4477 Woodson Rd, Suite 100, St. Louis, MO 63134. Book at painmd.tv/appointment/ or call (314) 481-5000.
Key takeaways
- The endoplasmic reticulum and mitochondria are tethered partners; when one struggles, the other feels it.
- Overwhelmed cells trigger the unfolded protein response, diverting energy from repair to survival.
- ER stress is well-established cell biology, increasingly linked to chronic pain and non-healing tissue.
- Resolving the underlying stress so cells can repair is the goal — start at painmd.tv/appointment/.
Medically reviewed by Dr. Gurpreet Singh Padda, MD, MBA, MHP — Board Certified in Anesthesiology, Pain Medicine, Interventional Pain Management, Addiction Medicine, and Obesity Medicine. Last reviewed July 2026.
This article is educational and is not a substitute for evaluation, diagnosis, or treatment by a physician. Individual results vary. Do not start, stop, or change any medication without consulting your physician.
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Dr. Gurpreet Singh Padda, MD, MBA, MHP
