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PAIN AND HOW DO WE SENSE IT Within Us,axomlive

PAIN AND HOW DO WE SENSE IT Within Us

Nergal Scott by Nergal Scott
5 years ago
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PAIN AND HOW DO WE SENSE IT Within Us,axomlive

If someone has a pain in his hand, one does not comfort the hand, but the sufferer – Philosopher Ludwig Wittgenstein, 1953. What is pain? It might seem like an easy question. The answer, however, depends on who you ask. Some say pain is a warning signal that something is damaged, but what about pain-free major trauma? Some say pain is the body’s way of telling you something is wrong, but what about phantom limb pain, where the painful body part is not even there? Pain scientists have reasonably agreed that pain is an unpleasant feeling in our body that makes us want to stop and change our behaviour. We no longer think of pain as a measure of tissue damage—it doesn’t actually work that way even in highly controlled experiments. We now think of pain as a complex and highly sophisticated protective mechanism. Our body contains specialised nerves that detect potentially dangerous changes in temperature, chemical balance, or pressure. These “danger detectors” (or “nociceptors”) send alerts to the brain, but they cannot send pain to the brain because all pain is made by the brain. Pain is not actually coming from the wrist you broke, or the ankle you sprained. Pain is the result of the brain evaluating information, including danger data from the danger detection system, cognitive data such as expectations, previous exposure, cultural and social norms and beliefs, and other sensory data such as what you see, hear, and otherwise sense.

The brain produces pain. Where exactly in the body the brain produces the pain, is a “best guess scenario”, based on all the incoming data and stored information. Usually, the brain gets it right, but sometimes it doesn’t. An example refers pain in your leg when it is your back that might need the protecting. It is pain that tells us not to do things—for example, not to lift with an injured hand, or not to walk with an injured foot. It is pain, too, that tells us to do things—see a physio, visit a GP, sit still and rest. We now know that pain can be “turned on” or “turned up” by anything that provides the brain with credible evidence that the body is in danger and needs protecting.
So is pain all about the brain and not at all about the body? No, these “danger detectors” are distributed across almost all of our tissues and act as the eyes of the brain. When there is a sudden change in tissue environment—for example, it heats up, gets acidic (cyclists, imagine the lactic acid burn at the end of a sprint), is squashed, squeezed, pulled, or pinched—these danger detectors are our first line of defence.

PAIN AND HOW DO WE SENSE IT Within Us.

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They alert the brain and mobilise inflammatory mechanisms that increase blood flow and cause the release of healing molecules from nearby tissue, thus triggering the repair process. Local anaesthetic renders these danger detectors useless, so danger messages are not triggered. As such, we can be pain-free despite major tissue trauma, such as being cut for an operation. Inflammation, on the other hand, renders these danger detectors more sensitive, so they respond to situations that are not actually dangerous. For example, when you move an inflamed joint, it hurts a long way before the tissues of the joint are actually stressed.

Danger messages travel to the brain and are highly processed along the way, with the brain itself taking part in the processing. The danger transmission neurones that run up the spinal cord to the brain are under real-time control from the brain, increasing and decreasing their sensitivity according to what the brain suggests would be helpful.
So, if the brain’s evaluation of all available information leads it to conclude that things are truly dangerous, then the danger transmission system becomes more sensitive (called descending facilitation). If the brain concludes things are not truly dangerous, then the danger transmission system becomes less sensitive (called descending inhibition). Danger evaluation in the brain is mindbogglingly complex. Many brain regions are involved, some more commonly than others, but the exact mix of brain regions varies between individuals and, in fact, between moments within individuals.

PAIN AND HOW DO WE SENSE IT Within Us
To understand how pain emerges into consciousness requires us to understand how consciousness itself emerges, and that is proving to be very tricky. To understand how pain works in real-life people with real pain, we can apply a reasonably easy principle: any credible evidence that the body is in danger and protective behaviour would be helpful will increase the likelihood and intensity of pain. Any credible evidence that the body is safe will decrease the likelihood and intensity of pain. It is as simple and as difficult as that.
To reduce pain, we need to reduce credible evidence of danger and increase credible evidence of safety. Danger detectors can be turned off by local anaesthetic, and we can also stimulate the body’s own danger-reduction pathways and mechanisms. This can be done by anything that is associated with safety—most obviously accurate understanding of how pain really works, exercise, active coping strategies, safe people and places. A very effective way to reduce pain is to make something else seem more important to the brain—this is called distraction. Only being unconscious or dead provide greater pain relief than distraction. In chronic pain the sensitivity of the hardware (the biological structures) increases so the relationship between pain and the true need for protection becomes distorted: we become over-protected by pain. This is one significant reason there is no quick fix for nearly all persistent pains. Recovery requires a journey of patience, persistence, courage, and good coaching. The best interventions focus on slowly training our body and brain to be less protective

By Dr. Satya Prakash

Tags: brainfell painhuman painpainpain cellspain in bodypain stimulus
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