Pain and Inflammation: Understanding the Connection

How inflammation can increase pain sensitivity, why pain sometimes persists, and what may help the body move toward recovery

Pain and inflammation often arrive together, which makes it easy to assume they are essentially the same thing. They aren’t, but the relationship between them can tell us a great deal about what happens when an injury heals normally and what may be happening when pain continues long after we expected it to improve.

Think about a sprained ankle. The body quickly begins an inflammatory response designed to protect the injured area and start repair. Blood flow changes, immune cells arrive, and chemical messengers are released into the surrounding tissue. The ankle may become warm, swollen, red, tender, and painful, all familiar signs that something has happened and the body has responded.

In this situation, inflammation is doing an important job.

The picture becomes more complicated when inflammatory activity persists, is driven by an ongoing health condition, or begins interacting with a nervous system that has become increasingly sensitive to pain.

Researchers now understand much more about this relationship than they did when we first wrote this article. Inflammatory substances such as prostaglandins, cytokines, and bradykinin can interact with pain-sensing nerves, changing how readily those nerves respond to stimulation. If pain persists, the peripheral nerves, spinal cord, brain, immune system, and inflammatory processes can all become part of a much larger pain picture.

This is why, at Pain Free For Life, we want to look beyond How can I make this pain stop? and ask another important question: What may be keeping this pain going?

Overview: What’s the Connection Between Pain and Inflammation?

Pain and inflammation often appear together, but understanding how they interact can help explain why some pain improves as the body heals while other pain becomes much more persistent.

Inflammation is part of the body’s normal response to injury, infection, and other threats. It helps coordinate protection and repair, and pain can be part of that process. When inflammatory activity continues, however, chemical messengers involved in the response can affect nearby pain-sensing nerves and make an already irritated area more sensitive.

The relationship becomes even more interesting when pain lasts for months or years. Chronic pain can involve the original tissue as well as changes in nerves, the spinal cord, brain, immune activity, movement, sleep, stress, and other factors that influence how pain is experienced and how well the body recovers.

That gives us a much better question than simply asking how to suppress pain: What may be contributing to it, and what is keeping it going?

In this article, we’ll explore:

Why inflammation is an important part of normal healing
How inflammation can increase pain sensitivity
Why not all chronic pain is caused by inflammation
What peripheral and central sensitization mean
Why addressing contributing factors can matter alongside pain relief
How nutrition, movement, sleep, and stress fit into the Pain Free For Life approach
Where microcurrent and Vagus Nerve Stimulation may fit
Why the goal is healthy inflammatory regulation rather than eliminating inflammation altogether

Watch Dr. Rob’s Video: 10 Signs of Inflammation

Inflammation Is Part of Healing

Inflammation has developed such a bad reputation that it is easy to forget we actually need it.

The inflammatory response is part of the body’s normal defense and repair system. When tissue is injured, or the immune system detects a threat, inflammatory signals help coordinate what happens next. Blood vessels respond, immune cells move into the affected area, and chemical messengers help organize the work involved in protection and repair.

The classic signs of acute inflammation include redness, heat, swelling, pain, and loss of function, although they will not necessarily all appear in every situation.

Pain belongs on that list for a reason. Inflammatory mediators can make nociceptors, the sensory nerves involved in detecting potentially damaging stimuli, more responsive. This is why skin around a fresh injury can become unusually tender or why pressure on an inflamed joint may hurt much more than the same amount of pressure normally would.

During a healthy healing response, this increased sensitivity can serve a useful purpose by encouraging us to protect an injured area while repair is underway. The concern is not that inflammation occurred in the first place, but that inflammatory activity may become prolonged or continue because of an underlying disease, repeated injury, metabolic factors, ongoing immune activity, or other influences.

If you want to understand that process in greater detail, our Complete Guide to Inflammation explores the differences between acute and chronic inflammation, common contributors, symptoms, and the many ways inflammation can affect the body.

How Inflammation Can Increase Pain Sensitivity

When tissue becomes inflamed, the chemical environment around nearby nerves changes. Inflammatory mediators can interact with receptors and ion channels on nociceptors, lowering the threshold required for those nerves to respond. Researchers refer to this process as peripheral sensitization, and it helps explain why an inflamed area may become more sensitive to pressure, temperature, movement, or touch.

When pain signaling continues for a long time, changes can also occur farther along the pathway. The spinal cord and brain may become increasingly responsive to incoming signals, contributing to a process known as central sensitization.

This gives us a much more complete understanding of chronic pain than the old assumption that the amount of pain someone feels must directly reflect the amount of tissue damage present. An injury may have started the process, but inflammation, immune activity, nerve sensitivity, sleep, stress, movement patterns, previous injuries, and the nervous system can all influence what happens afterward.

Longtime Pain Free For Life readers may recognize this as part of the pain-brain connection we have discussed for years. When pain has persisted for months or years, looking only at the place that hurts may leave important parts of the picture unexplored.

There is an emotional side to living with persistent pain as well. Chronic pain can affect sleep, relationships, work, activity, confidence, and the way someone feels about what their body is capable of doing. Our holistic guide to mentally coping with chronic pain explores that part of the experience and offers practical ways to support yourself while working toward better pain management.

Does All Chronic Pain Come From Inflammation?

This is an important place to update the way we have discussed inflammation in the past.

Inflammation plays a significant role in many painful conditions, including inflammatory arthritis, autoimmune diseases, infections, tissue injuries, and other disorders. Researchers are also investigating inflammatory and neuroimmune mechanisms in a much wider range of chronic pain conditions.

However, inflammation is not the source of every chronic pain problem, nor does the amount of inflammation necessarily predict how much pain someone will experience.

Neuropathic pain, for example, can involve damaged or dysfunctional nerves. Osteoarthritis may involve structural changes, inflammation, mechanical stress, and nervous-system factors. An old injury can continue to hurt after the initial inflammatory response has resolved, particularly when the nervous system has become sensitized.

This helps explain why someone can experience significant pain without obvious swelling or redness, while another person may have measurable inflammation without experiencing the same degree of discomfort.

Rather than trying to fit every person into one explanation, we find it more useful to understand what is contributing to this person’s pain and what may be preventing recovery.

Digging Deeper Than the Pain

The original version of this article compared chronic pain treatment to dealing with weeds in a garden, and the analogy is still useful.

If you repeatedly cut off the leaves without understanding why the weeds keep returning, you may spend a great deal of time managing what you can see while leaving the conditions underneath unchanged.

Pain relief still matters enormously. Anyone who is hurting deserves relief, and medications, rehabilitation, injections, surgery, complementary therapies, and other treatments can all have an appropriate place depending on the condition and the person. Readers interested in additional supportive approaches can also explore our 9 Natural Pain Relievers.

The larger goal is to avoid confusing symptom relief with a complete understanding of what is driving persistent pain.

If inflammatory disease is contributing, that condition may need medical treatment. When loss of strength and movement are part of the problem, appropriate rehabilitation may help restore function. Poor sleep can affect pain sensitivity and recovery, while prolonged stress can place additional demands on a nervous system already dealing with persistent discomfort.

Sometimes an old injury, scar, nerve problem, metabolic condition, autoimmune disease, or another health concern also needs attention, and several of these influences can be present at the same time.

At Pain Free For Life, getting closer to the root does not mean searching endlessly for one hidden cause that explains everything. It means understanding enough of the pain picture to identify the factors we can address.

The Pain Free For Life Approach

This is why our approach to chronic pain extends beyond the painful area itself and why we do not expect microcurrent to carry the entire responsibility for recovery.

The Pain Free For Life approach brings together five interactive areas:

Stress Reduction
Nutrition
Fitness
Sleep
Microcurrent Therapy

Each contributes something different to the environment in which pain and recovery occur.

Nutrition can influence metabolic and inflammatory health while providing the protein, healthy fats, fiber, vitamins, minerals, and plant compounds involved in normal cellular function and repair. Rather than searching for one miracle food, our Comprehensive Guide to an Anti-Inflammatory Diet looks at the larger eating pattern and practical ways to incorporate more supportive foods into everyday meals.

Appropriate movement supports circulation, strength, mobility, metabolic health, and nervous-system function. Restorative sleep gives the body essential time for maintenance and recovery and can influence pain sensitivity, while stress reduction may help lessen some of the physiological strain that makes pain, muscle tension, and sleep more difficult to manage.

Microcurrent adds another form of support by working with the electrical side of the body and can be incorporated into protocols focused on pain, nervous-system regulation, circulation, and tissue recovery.

The value of these five areas comes from the way they work together. Someone who uses microcurrent consistently but sleeps only a few hours each night, has stopped moving because activity has become painful, or has an inflammatory condition that has not been properly treated may need a very different plan from someone recovering from a straightforward injury.

The treatment needs to follow the person rather than the symptom alone.

Where Microcurrent May Fit With Pain and Inflammation

Microcurrent therapy uses very low levels of electrical current and has long been incorporated into Pain Free For Life protocols for painful, inflamed, injured, and recovering tissue.

When an area is painful and inflamed, we are interested in more than temporarily changing the pain signal. We want to understand how the tissue is functioning, whether movement and circulation have been affected, how the nervous system is responding, and what else may be interfering with recovery.

This is why microcurrent protocols can vary considerably depending on the problem being addressed. A painful knee after an injury may call for a different approach from neuropathic pain, an old surgical area, or widespread chronic discomfort.

Nervous-system-focused treatments may also become part of the plan. The vagus nerve is particularly interesting because it provides an important communication pathway between the brain and internal organs and participates in autonomic and immune regulation. Research into what is sometimes called the inflammatory reflex has helped clarify how neural pathways, including the vagus nerve, can influence immune signaling.

Our guide to non-invasive Vagus Nerve Stimulation takes a closer look at why this nerve matters and how it fits into the larger microcurrent conversation.

If you already own an Avazzia Life device and are looking for practical treatment information, you can also learn how to perform microcurrent Vagus Nerve Stimulation. Always follow the approved instructions for your particular device and protocol, and work with your Treatment Coordinator when personalized support is included with your eligible membership.

There is no single universal “inflammation treatment.” A swollen knee following an injury, inflammatory arthritis, neuropathic pain, and widespread chronic pain are different problems even when inflammatory processes are involved somewhere in the picture.

Microcurrent can be one useful tool, but knowing what you are trying to support makes the treatment much more meaningful.

Appropriate Inflammatory Response

When people talk about an anti-inflammatory lifestyle, the language can sometimes suggest that less inflammation is always better. The body actually needs inflammation to defend against infection and participate in the repair of injured tissue. Just as importantly, the body has active biological processes devoted to resolving inflammation once the initial work has been accomplished.

A healthier goal is to support an inflammatory response that occurs when it is needed and is able to move toward resolution when that work is done.

For someone living with chronic pain, this may involve treating an underlying health condition while also looking at sleep, nutrition, metabolic health, movement, stress, nervous-system regulation, and other factors that influence the body’s ability to recover.

Much of this support happens through ordinary choices repeated consistently over time. Our guide to 10 Holistic Daily Habits to Manage Chronic Pain brings many of these ideas together into practical ways to support your body from day to day

Learn More About Inflammation and Chronic Pain

If you want to explore the relationship between inflammation and persistent pain in greater depth, our free special report, Inflammation: The Hidden Source of Chronic Pain looks at chronic inflammation, the pain cycle, and strategies we use within the Pain Free For Life approach.

Understanding inflammation will not provide one explanation for every chronic pain condition, but it can help us ask better questions about what the body needs. Instead of concentrating only on stopping the pain signal, we can begin looking at what may be sustaining the pain, what is interfering with recovery, and which parts of that picture we can change.

That is where a more complete approach to chronic pain begins.

Sources Cited

Fang XX, et al. Inflammation in Pathogenesis of Chronic Pain: Foe and Friend. Molecular Pain. 2023.
https://pubmed.ncbi.nlm.nih.gov/37220667/

Matsuda M, Huh Y, Ji RR. Roles of Inflammation, Neurogenic Inflammation, and Neuroinflammation in Pain. Journal of Anesthesia. 2019.
https://pubmed.ncbi.nlm.nih.gov/30448975/

Ji RR, et al. Immune Regulation of Pain: Friend and Foe. Science Translational Medicine. 2021.
https://pubmed.ncbi.nlm.nih.gov/34757809/