Pain is how the body tells us that something is wrong. If you touch something hot, your nerves send a message to your brain that says, “Ouch!” That kind of pain is helpful because it protects you.
But sometimes pain lasts much longer than it should. This is called chronic pain. Scientists are learning that long-lasting pain is not just about nerves. The immune system also plays a big role.
This article by Hodges et. al (2026) explains how the nervous system (which feels pain) and the immune system (which helps fight injury and disease) talk to each other and can sometimes keep pain going.
What Is the Immune System?
The immune system is the body’s defense team. It helps heal injuries and fight infections. When you get hurt, immune cells rush to the area to help fix the problem.
These immune cells release chemical messengers that tell the body what to do next. Normally, once healing is finished, those signals quiet down.
But sometimes they do not.
How the Immune System Can Increase Pain
The article explains that immune cells can send signals that make pain nerves more sensitive. This means the nerves react more strongly than they should.
When this happens:
- Pain can feel stronger
- Pain can last longer
- Pain can continue even after the injury has healed
This helps explain why some people hurt even when X-rays or scans look normal.
Why Pain Can Stick Around
In chronic pain, the immune system may stay active for too long. This keeps telling the nerves to send pain signals, even when the body does not need them anymore.
The article describes pain as more than just a “broken part.” It is a problem involving the whole system, including nerves, immune cells, and the brain.
Why This Research Matters
Many pain treatments focus only on blocking pain signals. But if the immune system is helping keep pain turned on, then just blocking pain may not be enough.
By understanding how immune cells and nerves work together, scientists hope to create better and safer treatments for long-lasting pain.
How This Applies to Dogs, Cats, and Other Animals
Animals feel pain in very similar ways to people. Dogs, cats, horses, and humans are all mammals, and they share many of the same nerve and immune pathways.
This means:
- Chronic pain in animals is not just “wear and tear”
- The immune system may also help keep pain going in pets
- Pain can exist even when X-rays or scans do not show severe damage
This is especially important for conditions like:
- Osteoarthritis
- Chronic back or neck pain
- Nerve-related pain
- Pain after injury or surgery
Some newer pain treatments in veterinary medicine already target specific pain pathways. This research reminds us that pain relief must be balanced carefully, because blocking pain too strongly could hide injuries or slow healing.
What This Means for Pet Owners and Veterinarians
Pain is complex. If a pet seems painful but tests look “normal,” the pain is still real.
Understanding the role of the immune system helps explain:
- Why some pets do not respond to standard pain medicines
- Why a multimodal approach (medications, rehab, weight control, and movement) works best
- Why ongoing research is important for safer long-term pain control
Here is a link to the article – https://www.sciencedirect.com/…/pii/S2468781225002322
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