Human beings seem to feel it differently, different cultures display it differently, some people seem to be more or less tolerant of it and different sexes may have different thresholds to it. Some people view pain as an unnecessary evil that must be endured, others see it as a gift which allow us to protect ourselves from harm.
Pain is a complex concept to define since it is not necessarily just a central brain response to injury. It can be a response to impending injury or perceived injury. Indeed to make it more complicated we often describe significant and difficult life events such as the loss of a loved one as a psychological, emotional or a spiritual pain. Other types of pain include nociceptive, neuropathic, inflammatory, somatic, visceral, phantom, migrainous, and psychogenic. These and many others which will be discussed in a later blog.
Pain is certainly very common! It has been estimated that some 10 million people in the UK live with chronic pain and this is responsible for approximately one-fifth of all presentations to family doctors. One in four households are affected by chronic pain. In 2009 50 million workdays were lost in the UK due to pain and the cost to the UK economy in doctors time, medicines and workdays lost has been estimated at £13 billion!
The International Association for the Study of Pain has coined the following definition: "Pain is an unpleasant sensory and emotional experience associated with actual or potential tissue damage, or described in terms of such damage.” Doctors often use a simpler explanation, “Pain is what the patient says it is.”
In evolutionary terms pain has evolved to keep our bodies safe and to keep us alive. Pain is the signal to the brain that the body has been harmed or is under threat and allows us to respond appropriately to that threat. Children learn at a very young age, usually by trial and error, that the top of the stove is hot and that cut glass is sharp. They learn that these are things that can harm them and they learn to avoid them. In this way pain is a gift that allows us to protect ourselves. There is in fact an extremely rare genetic condition called ‘congenital insensitivity to pain’ or ‘congenital analgesia’ in which suffers feel no pain. They are unable to protect themselves from injury and can suffer appalling injuries without knowledge or sensation thereby severely limiting life expectancy. In this regard pain can certainly be considered a gift.