Inflammatory Pain: The Role of Inflammation in Pain

What is inflammatory pain?

When we talk about "inflammatory pain," we're referring to pain associated with an inflammatory process in the tissues. But contrary to what many people think, inflammation itself doesn't directly cause pain—rather, it makes your nervous system more sensitive to stimuli.

Understanding this distinction is important for effectively managing this type of pain and choosing the right treatment approaches.

Inflammation: An Essential Healing Process

Why Your Body Causes Inflammation

Inflammation is your body's protective response. When you get hurt, your immune system triggers a series of reactions:

• Increased blood flow to the area (resulting in redness and warmth)
• Release of chemicals that attract repair cells
• Swelling that helps immobilize the area
• Increased sensitivity in the nerves that prompts you to protect the area

These reactions are essential for healing. Without inflammation, your tissues would not be able to repair themselves effectively.

The classic signs of inflammation

The Romans had already identified the five cardinal signs of inflammation:

• Flushing (redness): caused by increased blood flow
• Heat: also caused by increased blood flow
• Swelling: caused by the accumulation of fluid
• Pain: caused by nerve hypersensitivity
• Functio laesa (loss of function): limited range of motion

How does inflammation cause pain?

An awareness-raising initiative

Here’s something important to understand: inflammation generally doesn’t directly cause nociception (pain signals). Instead, it makes your nervous system more sensitive.

The chemicals released during inflammation (prostaglandins, cytokines, etc.) act on the pain receptors in your tissues and make them more sensitive. That is why:

• Even light pressure that wouldn't normally hurt becomes painful
• The movements are more uncomfortable
• The area remains tender even at rest

The pressure of the edema

The swelling associated with inflammation also puts pressure on the surrounding tissues, including the nerves. This mechanical pressure can itself trigger pain signals.

Acute inflammation vs. chronic inflammation

Acute inflammation: Useful and temporary

After an injury, acute inflammation:

• Lasts from a few days to a few weeks
• An integral part of the healing process
• Fades naturally as the tissue heals

• Recent ankle sprain
• Whiplash injury following an accident
• Acute tendinitis

Chronic Inflammation: When the Body Goes Into Overdrive

Sometimes, inflammation persists beyond its useful role:

• It may become "low-grade" but persistent
• It continues to stimulate the nervous system
• It may contribute to chronic pain

• Osteoarthritis (with variable inflammatory component)
• Rheumatoid arthritis (autoimmune inflammation)
• Certain chronic tendinopathies
• Inflammatory bowel diseases

Inflammatory pain in common conditions

Osteoarthritis

Contrary to what was long believed, osteoarthritis is not simply a result of mechanical wear and tear. There is often a low-grade inflammatory component that contributes to pain and the progression of the disease.

This is why some people with lumbar osteoarthritis or cervical osteoarthritis experience flare-ups characterized by increased pain, morning stiffness, and swelling.

Tendinopathies

Irritated tendons often exhibit an inflammatory response, especially in the early stages. In fact, the term “tendinitis” (inflammation of the tendon) is increasingly being replaced by “tendinopathy” because inflammation is not always the primary mechanism.

Autoimmune diseases

In conditions such as rheumatoid arthritis, the body mistakenly attacks its own tissues, causing chronic inflammation. These conditions require specific medical care.

Strategies for Managing Inflammatory Pain

During the acute phase

It makes sense to protect the injured area in the first few days, but prolonged complete rest is rarely beneficial. The goal is to find the right balance between protection and movement.

Applying cold can help reduce inflammation and swelling during the first 48 to 72 hours. Apply for 15 to 20 minutes at a time, using a protective barrier between the ice and your skin.

For members, these strategies help reduce swelling.

NSAIDs (ibuprofen, naproxen) can be helpful in the short term, but long-term use carries risks. Consult a healthcare professional before using them regularly.

In the medium and long term

Gradual physical activity promotes healing and helps reduce low-grade chronic inflammation. It is one of the most powerful tools at your disposal.

Certain foods promote inflammation (refined sugars, trans fats, ultra-processed foods), while others reduce it (fatty fish, colorful vegetables, nuts, olive oil). A Mediterranean-style diet is associated with lower levels of systemic inflammation.

Excess body fat produces pro-inflammatory substances. Maintaining a healthy weight reduces this low-grade inflammation.

Poor-quality sleep exacerbates inflammation. Prioritizing quality sleep is an anti-inflammatory strategy that is often overlooked.

Chronic stress keeps your body in a state of inflammation. Stress management strategies (breathing exercises, exercise, rest periods) can help.

Physical Therapy and Inflammation

What physical therapy can do

Physical therapy offers several approaches for inflammatory conditions:

Determine the role of inflammation in your condition and adjust your treatment accordingly.

Prescribe exercises that are appropriate for the healing phase and promote recovery without aggravating inflammation.

Certain techniques can help manage local inflammation (manual therapy, physical modalities).

To help you understand your condition and manage flare-ups.

What you can do

• Stay physically active on a regular basis in a way that suits your condition
• Recognize the signs of an inflammatory flare-up (heat, redness, increased swelling)
• Adjust your activity level during flare-ups
• Follow the anti-inflammatory strategies mentioned above

When inflammation isn't the whole story

Other types of pain

It is important to recognize that not all pain is inflammatory. Neuropathic pain (related to the nerves) and nociceptive pain (related to sensitization of the nervous system) have different mechanisms and require different approaches.

Mixed pain

In reality, many conditions involve multiple mechanisms. Your back pain or neck pain may have an inflammatory component, a mechanical component, and a sensitization component—all of which interact with one another.

That is why a comprehensive approach, which takes all these factors into account, is generally more effective than one that targets only a single mechanism.

Key takeaways

• Inflammation is a healing process —it is beneficial during the acute phase

• Inflammation makes you more sensitive to pain rather than directly causing it —it makes your nerves more reactive

• Chronic inflammation can contribute to persistent pain and requires a long-term approach

• Exercise, diet, sleep, and stress management are powerful anti-inflammatory strategies

• A comprehensive approach that takes into account all the mechanisms of pain is more effective than focusing exclusively on inflammation

Additional Resources

• Understanding Chronic Pain
• Acute pain vs. chronic pain
• Neuropathic pain
• Nociplastic pain
• Pain Management Strategies