What is your pain from zero to ten, ten being the worst pain you have ever felt? Does that look like anything you have come across before at a doctor’s office? If you have a child you may have come across the faces pain scale. A common variation found in many pediatric clinics. There is a long list of
pain scale variations, each with their own set of advantages and disadvantages. The major problem across the board is that you can not collect true objective data in a subjective manner.
“Pain is an unpleasant feeling that is conveyed to the brain by sensory neurons. The discomfort signals actual or potential injury to the body. However, pain is more than a sensation, or the physical awareness of pain; it also includes perception, the subjective interpretation of the discomfort. Perception gives information on the pain's location, intensity, and something about its nature. The various conscious and unconscious responses to both sensation and perception, including the emotional response, add further definition to the overall concept of pain.”(
Online Medical Dictionary)
Philosophy has dealt with the problem with pain as far back as Plato’s The Republic, written in 380 BC. Plato speaks of reality through his theory of forms. In his famous
allegory of the cave, Plato speaks of reality being like shadows on a wall. We do not ever see the truth, just the shadows that we use to make inferences of reality. Rene Descartes (1596-1650) proclaimed “
Cognito ergo sum” or “I think therefore I am.” He explains how perception must be part sensory and part cognitive. This is, for example, how one can observe a candle melt into liquid wax yet still know that the solid candle and the melted wax are one in the same. In fact, the oldest quantitative law in psychology is the
Weber-Fechner law, a law concerned with the relationship between the intensity of physical stimuli and their perceptual effects. Ernst Weber found a logarithmic relationship between stimulus and perception.
What all of this means is that on a pain scale, my severed arm might feel like your stubbed toe. But with a stubbed toe and a pain rating of ten, I have learned something valuable about you and your road to recovery: you have a very low pain threshold and it’s going to be a long road. And that is in fact the value of the pain scale. Its benefit and its downfall walk hand in hand. You can not accurately describe pain with severity alone but you can use the data for other purposes. Maybe you will be less aggressive; maybe you will start with a more passive approach, either way you can avoid scaring off a patient and formulate the best way to approach his or her treatment.
And what if I walk into your office years after my severed arm and I circle a ten again for my pain? You better give me some immediate medical attention because something is seriously wrong. Unlike the other guy, when I cry wolf granny has been eaten and I am about to be dessert. However, if I walk in with a stubbed toe and a pain level of two you can more than likely be as aggressive as you would like for a quick recovery.
Pain scale ratings are important and very necessary. Use them as a basis for treatment approach and use them as a way to monitor progress. If you would like something more reliable, use more complex pain scales such as the
McGill Pain Questionnaire which uses twenty subclasses of words that break down into four major groups to describe the sensory qualities of pain, the affects of pain, the overall experience of pain and some miscellaneous characteristics of pain. No matter which pain scale you use and how you use it just remember this: perception is reality and perceiving is believing.