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Dr. David Miller ND
Home
Working Together
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The Stomach is the Boss
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About
Contact
HOMA-IR Insulin Resistance Calculator
Motility Resilience Protocol
High Yield Elimination Diet
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What Kinds of Conditions Can Involve Heightened Sensitivity?

Heightened sensitivity, amplification or difficulty recovering can be seen across a number of different conditions.

Examples include:

  • Fibromyalgia

  • Migraine

  • Irritable bowel syndrome (IBS) and other disorders of gut-brain interaction

  • ME/CFS (Chronic Fatigue Syndrome)

  • Long COVID

  • Chronic pelvic pain and bladder pain syndromes

  • Persistent musculoskeletal pain

  • Dysautonomia

These conditions are not the same, and sensitivity does not necessarily arise from the same mechanism in each of them.

But each provides an example of how the body's response to sensory input, pain, exertion, internal sensations or physiological stress can become amplified or more difficult to recover from.

Fibromyalgia

Ordinary pressure, movement or touch may become painful, while exercise, poor sleep or stress can lead to a prolonged increase in symptoms.

Changes in how pain signals are processed and regulated within the nervous system are thought to contribute.

Migraine

Sensitivity may be much more obviously sensory.

Light can feel painfully bright. Normal sounds can become intolerable. Smells that other people barely notice may provoke nausea, discomfort or headache.

Irritable Bowel Syndrome and Disorders of Gut-Brain Interaction

Here, the sensitivity may come from inside the body.

Normal intestinal stretching, gas, meals or changes in motility can produce much greater discomfort than would ordinarily be expected.

This is often referred to as visceral hypersensitivity.

ME/CFS

In myalgic encephalomyelitis/chronic fatigue syndrome, physical or mental exertion can lead to a delayed and prolonged worsening of symptoms rather than a normal short period of fatigue followed by recovery.

This is an important example of how sensitivity may involve not only the size of the initial response, but also difficulty recovering afterward.

Long COVID

Some people with Long COVID experience exercise intolerance, sensory sensitivity, autonomic symptoms and prolonged difficulty recovering after physical or cognitive stress.

Chronic Pelvic Pain and Bladder Pain Syndromes

In some chronic pelvic and bladder pain conditions, the nervous system may become increasingly responsive to signals arising from the affected tissues.

Sensations that would normally be mild may become painful, urgent or difficult to ignore.

Persistent Musculoskeletal Pain

Sensitivity and amplification can also become part of some persistent musculoskeletal pain conditions.

Examples can include chronic low back pain, persistent neck pain, whiplash-associated disorders and temporomandibular (jaw) pain.

In these situations, pressure, movement or other physical input may begin to produce a larger response than would ordinarily be expected.

This does not mean that the original injury or tissues are irrelevant. Rather, in some people, persistent pain can involve changes both in the tissues themselves and in how incoming signals are processed, amplified and regulated by the nervous system.

Dysautonomia (including POTS)

In some forms of dysautonomia, relatively ordinary challenges such as standing, heat, eating or exercise can provoke a much larger autonomic or cardiovascular response than expected. Postural orthostatic tachycardia syndrome (POTS) is one well-known example.

The Common Pattern

These conditions are not interchangeable, and they should not be treated as though they share one single cause.

But they can share an important pattern:

Sometimes the problem is not simply the stimulus itself.

What matters is the relationship between:

That relationship gives us a useful framework for understanding the sensitive patient.

  • The size of the stimulus

  • The state of the system receiving it

  • The size of the body's response

  • How long it takes to recover afterward

Pump Up the Jam

There is a time for arena rock, and there is a time for bedroom acoustic.

In a stadium, you expect the amplifier to be turned up. But that same level of amplification would be ridiculous on a quiet Tuesday night in your bedroom practicing acoustic guitar.

Our nervous system needs that same flexibility.

If you step on something sharp or hear a crash in the night, you want the signal turned up. But not every signal deserves arena-rock volume.

A healthy nervous system should be able to decide:

What deserves the amplifier?

What can stay acoustic?

And when is it time to turn the volume back down?

One concept that helps explain what happens when this regulation changes is central sensitization.

In a sensitized system, the threshold for responding may become lower, incoming signals may be amplified more strongly, and the mechanisms that normally dampen those signals may become less effective.

The result can be a system that brings out the arena amplifier for a bedroom-acoustic signal — and then struggles to turn it back down.

And amplifiers require power.

The same is true biologically. Nervous-system activity, sustained muscle contraction or guarding, cardiovascular responses, stress signalling, immune activity and recovery all require energy.

So when small inputs repeatedly produce large or prolonged responses, the system may not only become too loud.

It may also become more expensive to run.

What happens when the cost of responding begins to exceed the body’s ability to recover??

When Recovery

Can’t Keep Up

The body is built to meet a challenge, recover from it, and come back more capable.

That is what happens with weight training: muscle is stressed, rebuilt and strengthened. Cardiovascular training challenges the heart and circulation, and over time our endurance improves.

Challenge → Recovery → Adaptation

But adaptation does not happen for free.

Recovery requires energy and raw materials. Cells must restore ion gradients, regulate calcium, repair tissues, recycle signalling molecules and rebuild what was used.

So the important question is not simply:

How much stress did the body experience?

It is also:

Could the body generate enough usable energy to recover from it?

When demand repeatedly exceeds recovery capacity, the pattern can begin to change:

Challenge → Incomplete Recovery → Reduced Reserve → Greater Difficulty With the Next Challenge

This does not mean that every sensitive patient has a mitochondrial disorder.

But it does mean that energy production, delivery and recovery capacity matter.

Like a battery that will not fully recharge, the problem may not only be how much energy is being used.

It may also be how effectively the system can restore what was spent.

Resilience means being able to respond, recover and adapt.

What Lowers the Threshold?

Our threshold is not fixed.

It can change depending on the biological state of the system receiving the signal.

Poor sleep, persistent stress, pain, inflammation, hormonal changes, nutritional status, autonomic regulation, cellular energy production, environmental exposures and chemical stressors — and even the membranes surrounding our cells and organelles — can influence how we respond and how quickly we recover.

This helps explain why the same person may tolerate something well one day and poorly the next.

A meal. A workout. A medication. A loud environment. A stressful conversation.

The input may be similar. The system receiving it may not be.

Some of the factors that can influence that threshold include:

  • Sleep — inadequate sleep can increase pain sensitivity and make sensory input harder to regulate.

  • Stress and autonomic activation — persistent vigilance can keep the body biased toward responding rather than recovering.

  • Pain, inflammation and oxidative stress — ongoing inflammatory and pain signalling can keep sensory pathways activated, while excessive oxidative stress can interfere with cellular signalling, damage lipids and proteins, and place additional demands on mitochondrial and repair systems.

  • Environmental exposures and chemical stressors — smoke, solvents, air pollution, alcohol and certain occupational exposures can place additional demands on detoxification, antioxidant and repair systems. Some exposures can also directly irritate sensory pathways or contribute to inflammatory and oxidative stress.

  • Cell and organelle membranes — every cell is surrounded by a lipid bilayer, and our organelles have membranes of their own. These membranes are not simply packaging. They provide the environment in which receptors, ion channels and signalling proteins operate.

  • Mitochondrial membranes are particularly important: the machinery responsible for oxidative phosphorylation and ATP production is embedded within the inner mitochondrial membrane. Membrane structure and lipid composition therefore matter both for signalling and for energy production.

  • Nutrition and metabolic capacity — the body needs adequate substrates and micronutrients to produce energy, repair tissues and maintain these cellular structures.

  • Too much challenge without enough recovery — repeatedly exceeding capacity can leave progressively less reserve for the next demand.

  • Too little appropriate challenge — avoiding demand altogether can also reduce conditioning and resilience over time.

None of these factors alone explains every sensitive patient.

But together they reinforce an important principle:

The threshold depends on the condition of the system receiving the signal.

The goal is not to eliminate every stressor.

It is to improve the body's ability to filter, respond, recover and adapt.

Why I Started Looking Deeper

This work grew out of a simple clinical problem: some of my most sensitive patients needed better solutions.

These were often people who reacted strongly to medications, supplements, foods, exercise, stress or environmental exposures — sometimes even to interventions that would normally be considered gentle.

When the gentlest osteopathic work aggravated one of my sensitive patients, that was the last straw.

Trying to help them pushed me to look more deeply at why the system was responding so strongly in the first place — and at the factors that influence our ability to regulate, produce energy, recover and adapt.

That search is what led me deeper into nervous-system regulation, mitochondrial function, cellular energy production, oxidative stress, inflammation, membrane health and the other mechanisms discussed on this page.

Building a More Resilient System

If sensitivity reflects a system that is responding too strongly, recovering too slowly, or operating with too little reserve, the goal is not simply to avoid more and more triggers.

The goal is to increase capacity.

That may mean working on several areas at the same time:

  • Restore sleep — recovery, pain regulation, immune function and energy metabolism all depend on adequate sleep.

  • Support cellular energy production — adequate calories, protein, micronutrients and metabolic health provide the raw materials needed to generate ATP and repair what has been used.

  • Support cell membranes — healthy membrane structure helps create the environment in which receptors, ion channels, cellular signalling and mitochondrial energy production occur.

  • Reduce unnecessary physiological load — persistent inflammation, oxidative stress, environmental exposures, poorly controlled pain and excessive stress can all add to the amount the system is being asked to manage.

  • Improve nervous-system regulation — the nervous system needs to be able to turn the response up when necessary and, just as importantly, turn it back down afterward.

  • Support the gut — digestion, nutrient absorption, the intestinal barrier, immune signalling and gut-brain communication can all influence the wider system.

  • Reintroduce appropriate challenge — movement and exercise are not simply energy expenditures. When properly dosed and followed by recovery, they are signals that tell the body to become more capable.

The exact priorities will be different for every person.

But the direction is the same:

Reduce unnecessary load. Improve capacity. Recover. Adapt.

The goal is not to make the body insensitive.

The goal is to make it resilient enough that ordinary life no longer requires an extraordinary response.

When Sensitivity Starts Running the Show

If ordinary demands are producing extraordinary responses, it may be worth looking beyond the individual symptoms and asking what is affecting the system's ability to regulate, recover and adapt.

My approach is to look for the factors that may be increasing physiological load, lowering tolerance or limiting recovery — and then build a plan around the individual in front of me.

The goal is not to eliminate every stressor. It is to help the body become more capable of handling them.

Interested in whether this approach may fit your situation?

Book a free meet and greet