Can Your Cells Remember Pain? The Role of Mitochondria and Epigenetics in Chronic Pain

Some pain fades when an injury heals. Other pain lingers for years, even after there's nothing left to heal.

The answer isn’t what most people expect. The injury did heal. But the nerve cells changed and didn’t fully reset.

Two things drive it: mitochondria that stop working properly, and epigenetic mechanisms that silence genes that calm overactive nerves.

What you’re left with works like a memory. Not a memory of pain, but instructions written during the injury that never got erased.

How Acute Pain Becomes Chronic

It happens in three stages, and together they work like a SAD memory the body holds onto:

• S (Set Up): Within hours of an injury, sensory nerves become hypersensitive. Inflammation lowers the threshold at which they fire, so even light touch hurts. That settles as you heal. But sometimes the nerve’s settings don’t reset, even after the tissue heals.
• A (Attacked): The mitochondria begin working abnormally, creating reactive oxygen species (ROS) that can damage the nerve.
• D (Demolished): The damage becomes self-sustaining, with each round feeding the next. [1]

The nerve also loses some of its brakes as genes that control an overexcited neuron are silenced. [2] The alarm keeps sounding, but the switch that should turn it off isn’t working.

What Mitochondria Have to Do With Chronic Pain

Nerves are expensive to run. Every time one fires, it has to reset, and that takes energy from mitochondria.

After an injury, those mitochondria can get stuck running hot. A protein called ATPSc-KMT increases and changes how they work, so the nerve keeps burning fuel long after the pain has settled. [1, 3] Think of a cellular engine revving too high. It starts to smoke.

That smoke is part of the problem. The disrupted energy system produces more ROS, and when production outpaces the body’s defenses, oxidative damage builds. Nerves are especially vulnerable because they use a lot of oxygen and contain fats that are easily damaged by oxidation. [1]

Over time, the nerve has a harder time switching down. The channels that keep the nerve’s activity in check become less effective, so it fires without the usual trigger. [1]

This is why the pain feels real even when the original injury has healed.

How Epigenetics Can Keep Pain Signals Turned On

Mitochondrial stress explains how a nerve becomes over-excitable. It doesn’t explain why that change sticks. So why does it?

• Gene Expression: Epigenetic mechanisms change which genes a cell reads without changing the genetic code. These are like dimmer switches that control how much of a gene gets turned on or off.
• Changes After Injury: After an injury, those settings change across the pain pathway. G9a, an enzyme involved in gene silencing, turns down potassium channel genes in sensory neurons, which are the nerve’s own brakes.
• HDAC Activity: These enzymes make certain genes harder to read by tightening DNA around its supporting proteins.
• Molecular Memory: Nerve cells don’t divide, so these changes persist long after the injury has healed. [2]

Functional Medicine Approach to Address the Biology

Chronic pain is more than a signal that won’t switch off. Oxidative stress and inflammation push the nervous system into central sensitization, turning up the volume on pain.

They can also change which genes nerve cells can access. So we look beyond the pain signal itself. The focus is the environment around the nerve: oxygen delivery, mitochondrial function, and antioxidant defenses.

Testing helps us see where the system is under strain, including markers such as lipid peroxidation and 8-OHdG. We identify which systems may be contributing to the problem and address them accordingly.

Enhancing Oxygenation

Sensory nerves need a steady supply of oxygen. When diabetes or vascular disease restricts that supply, nerves can misfire and drive pain. [3]

The issue isn’t always how much oxygen is in your blood. It’s whether enough is reaching the tissue that needs it.

• Hyperbaric Oxygen Therapy (HBOT): You breathe pure oxygen under pressure, which forces far more of it into your plasma and delivers it to tissue that normal breathing struggles to reach. When nerves are short on it, restoring oxygen supply reduces inflammation and oxidative stress that keep them irritated. [4]
• Ozone Therapy: This one works backward from what you’d expect. Instead of adding antioxidants, ozone gives your cells a controlled dose of oxidative stress, just enough to wake up their own defense system and push them to build more of it. [5]

Blood Sugar Regulation

For people with diabetes, this is one of the most important pieces. Excess blood sugar forms advanced glycation end products (AGEs), which drive oxidative stress and inflammation in nerve tissue. These increase with the severity of neuropathy. [6]

Getting there is unglamorous, and it works: regular meals, portions, water instead of soda, and movement all help.

Restoring Redox Balance

NAD+ is a coenzyme your mitochondria use to turn fuel into energy. It also helps nerves manage oxidative stress. Chronic inflammation can lower NAD+ levels, which is exactly the situation chronic pain creates.

Food and lifestyle matter, but when absorption is an issue, direct delivery is another option:

• Intravenous (IV) Infusions: NAD+ goes straight into the bloodstream, where your cells can draw on it to rebuild their own supply. Doses vary depending on what we’re treating, generally somewhere between 250 and 1,000 mg.
• IM Injections: Less time in the chair and useful for maintaining support between infusions.
• Targeted Supplementation: Nicotinamide riboside (NR) and nicotinamide mononucleotide (NMN) support NAD+ production and can be used for daily maintenance.
• Diet: Boost NAD+ by consuming foods rich in Vitamin B3 (Niacin) and Tryptophan, such as liver, salmon, tuna, mushrooms, and asparagus.
• Metabolic Stressors: A ketogenic diet changes how the body uses energy and increases NAD+ availability.

Lifestyle Triggers

Exercise is still the most reliable way to improve mitochondrial function, and nothing here replaces it. But heat gets there by a different road. Raising tissue temperature triggers the heat shock response, activating proteins that repair cellular damage. In a small study, six days of deep-tissue muscle heating increased those proteins by 38-45% and improved mitochondrial capacity. [7]

Compounds That Support Your Antioxidant Defenses

Your cells have a built-in antioxidant master switch called Nrf2. Most of the time it’s inactive.

When oxidative stress increases, Nrf2 moves into the nucleus and turns on protective, anti-inflammatory enzymes. Activating it can reduce oxidative stress, neuroinflammation, and mitochondrial dysfunction; the processes behind pain. [8]

• Sulforaphane: Sulforaphane, found in broccoli sprouts, activates your cells’ own antioxidant defenses. In nerve-injured models, it reduced pain sensitivity and spinal cord inflammation. [8, 9]
• Turmeric (Curcumin): Nrf2 is kept in check by a protein called Keap1. Curcumin turns off that brake, which frees Nrf2 to move into the nucleus and do its job. Once there, it switches on the genes that help the cell defend itself against oxidative stress. [10]

Compounds That Act on Pain’s Epigenetic Switches

Nerve injury changes which genes your nerve cells can read. Some food compounds act on that same machinery.

It isn’t as simple as blocking one enzyme. Injury can upregulate or downregulate different enzymes, so the target matters. [2]

• Resveratrol (Red Grapes & Berries): Activates SIRT1, a protective enzyme that needs NAD+ to work. After nerve damage, its levels crash, opening the door to inflammation and cellular stress. Restoration of SIRT1 levels improves mitochondrial function and reduces pain sensitivity after nerve injury. [11]
• Ginger: Ginger moves in the opposite direction, acting on HDAC1, an enzyme that climbs in the spinal cord after nerve injury. In experimental studies, ginger extract prevented that rise and improved pain thresholds. [12]

Final Word

Pain isn’t a signal with nothing behind it. There are conditions driving it, and those can be worked on. That means looking beyond the signal itself: oxygen delivery, metabolic function, and the pathways involved in pain.

Docere means the doctor acts as a teacher, and it’s the part of naturopathic medicine I care most about. What you understand about your own body, you can act on. That’s why I explain the mechanism instead of just handing you a plan.

Medication can turn down the signal. The work here is understanding what’s making the noise in the first place.