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MRCO BLOG

Medical Musings, Health Hypotheses & Therapeutic Thoughts

9/10/2018

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What is Chronic Pain?

 
Dr. Edmund Bruce-Gardner
NOTE:  This blog post is essentially a copypasta of the page on the same topic; but it is so important a subject I wanted to make the information was available to all of our blog subscribers as well...

Chronic Pain

When we talk about 'chronic pain', we're not just talking about pain that has been going on for a long time; although that it is part of the definition.  Chronic pain, in this sense, involves changes to the way that information is carried and processed in our bodies.

To understand this a little better, we will have to consider (briefly!) the nature of pain and what it means.​

Pain is an output

PictureFrom Gifford (1998)
What this means is that all pain is produced by your central nervous system; that is, pain is the label your brain applies to information it really wants you to pay attention to. 

When you injure yourself, like burning your hand on a hotplate, your nerves send signals up to your spinal cord and brain. We call this nociception, or something like 'detection of something harmful or noxious'. Your brain then decides whether or not to call those signals 'pain'. 

From this point of view, the pain itself is just as real in something like phantom limb pain (when you (e.g.) have an arm amputated but can still feel pain in the hand) as when you accidentally stab yourself in the thigh while cutting a recipe out of a magazine (just a random example that sprang to mind).
​

So pain is not something you feel in your body, it is something that is created and projected out by your brain.  Put simply, it is an output, not an input.

Pain is an evolutionary strategy

Picture
In the case of touching your hand to a hot stove, you have already started moving your hand away by the time you feel the pain.

What the pain is intended to do is to point out to you that 
your unprotected hand is not the best way to turn that pancake, and that maybe next time you should use a spatula!

So the 
memory of pain makes us less likely to try and use our digits as kitchen utensils in the future as well as making us stop the behaviour causing the pain in the first place.
​

It also makes you take care of an area while it is healing, so serves a protective function.

So pain is just a warning signal, and in normal circumstances, it is a good thing.  Another way of saying this is that it is a adaptive strategy, or one that makes you more likely to stay alive.

​People who can't feel pain for one reason or another run a very real risk of ignoring a seemingly small injury that then becomes infected, and possibly life-threatening.

Pain is normal!

PictureImage by Studio224
Leading on from the above two points, it should be clear that pain is a normal function of our bodies when everything is working as it should, albeit one most of us don't really want!  It is meant to be unpleasant, otherwise it wouldn't work the way it does.  
Pain is what we experience when our brains have decided we are threatened or in danger, and wants us to do something about it.  

In the case of chronic pain, where the pain has persisted long past the point where we might have expected any injury to heal, the key is to identify why the brain feels threatened.

'Pain' is, tellingly, also used with respect to grief or loss, or loneliness.  This emotionally-laden 'pain' is crucial in understanding chronic pain - indeed, all pain! - as it reinforces the idea that these sensations are the result of many different inputs, and our emotions, thoughts, beliefs and behaviours are all important contributors to how we experience pain.

Pain and damage are not necessarily related

PictureThis image is from an asymptomatic 32 year old female. The red arrow shows where the spine has slipped forwards, the yellow points to the spinal cord doing a slalom around the step like an Olympic skiier! From Eliott et al (2010)
This starts to explain the idea that pain is an output, where trauma or tissue damage is not the only factor (as mentioned over on the page on age-related conditions like arthritis.)

We know from decades of medical imaging that people can have the most spectacular structural failures, like compression of the spinal cord or broken bones, and experience little to no pain or dysfunction. 

Sheehan (2010) for example, found that among asymptomatic (i.e. not having any symptoms) 60 year-olds, over 90% had degenerative or bulging discs.  21% had spinal stenosis, narrowing of the hollow middle bit of the spinal column, where your spinal cord sits.  One might imagine that squishing your spinal cord would result in some sort of symptoms, but not necessarily! 
​

See the image on the left for a truly mindboggling scan of a compressed spinal cord that did not result in any pain at all (they had the scan done for other reasons).

Anecdotal reports from wounded in wartime often describe bullet wounds and even severe trauma as an impact, like being bumped or knocked in a crowd.

At the other end of the spectrum, consider a paper cut. 

​If pain is just an evolutionary mechanism to warn you about damage, why does the bloody thing hurt so much! 

​​It is not deep, or (under normal circumstances) anything close to a serious danger to the body, but we react as if it was the next thing to losing a limb.

Chronic Pain

Pain is considered to be chronic if it persists, or lasts, longer than three months (or the expected healing time for the initial trauma, if there is one).

It may be in one area of the body, or widespread. 
​
Chronic pain can be extremely frustrating.  You may often not have a diagnosis because doctors cannot identify the 'cause' of the symptoms. 

​Current research and thinking is giving us a few more tools to help explain what is going on, however, as we have touched on above. 

​Essentially, we suffer from chronic pain when our brains have more 'evidence' that we are in danger than that we are safe.  By working to identify these aspects of our lives, we can try to shift the balance away towards 'safety'.
Picture

​VS
Picture
Picture
So how can osteopathy help?

An analogy I often use with my patients is to think about your central nervous system (or CNS, consisting of your brain and spinal cord) as a genius four year-old. 
It is incredibly discriminating and intelligent in some ways, and unsophisticated and stupid in others. 
Like a four year-old, it also has a tendency to throw tantrums (overreact with pain, for example). 
And also like a four year-old, the best way of getting through to it is repetition. 

By repeatedly moving and stretching areas where the body perceives pain, we can increase the 'positive feedback' coming from that area.
"Look, we are moving this painful shoulder in all these different ways, and the arm has not fallen off! Maybe it's OK to decrease the number of pain labels we are attaching to this area.  Maybe it's OK to relax a little!" 
This makes the CNS feel a little safer.


We can also help you with some of the other facets of your pain. 

​The folks over at NOI (the neuro-orthopaedic institute) have come up with this wonderful concept of 
DIMs ("Dangers In Me") and SIMs (Safeties in me) that can help identify unhelpful and helpful factors in your life that influence whether or not you feel pain. 
​
The more factors we can identify, the more chance we have of helping you get your CNS to a place where it feels safe, and where you do not feel pain.

References
Eliott, JM, Fleming, H & K Tucker (2010) "Asymptomatic spondylolisthesis and pregnancy"  J Ortho Sports Phys Ther 40:324 

Gifford, LS (1998)  "Pain, the tissues, and the nervous system: a conceptual model"  Physiotherapy 84(1):27-36
​
Sheehan, NJ (2010)    "Magnetic resonance imaging for low back pain: indications and limitations"  Ann Rheum Dis 2010; 69:7-11

Special mentions to The Sensitive Nervous System (Butler et al, 2000) and Explain Pain Supercharged (Butler et al, 2017), which are great resources around explaining both central and peripheral nueropathic pain and have informed my whole approach to chronic pain management.
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    Authors

    Drs. Edmund Bruce-Gardner and Soraya Burrows are osteopaths

    Dr. Claire Ahern is a clinical psychologist 



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