We can't live without it, but many of us struggle to live with it. Pain has an essential biological function, but too much — or the wrong sort — ruins lives and puts a sizeable dent in economic productivity. By David Holmes, infographic by Mohamed Ashour.
This type of pain is caused by the activation of nociceptors — specialized sensory neuronsthat are stimulated by noxious mechanical, thermal or chemical stimuli. Nociceptors transform these stimuli into electrical signals and relay them to the central nervous system. Nociceptive pain tends to be short-lived and associated with injury. But if it persists beyond 12 weeks, it becomes chronic pain — and its nature can change.
Unlike nociceptive pain, neuropathic pain is caused by damage to the somatosensory nervous system itself, as a result of trauma or disease. However, there is not always a clear link between disease states and neuropathic pain.
Painful diabetic peripheral neuropathy is one of the most common forms of neuropathic pain, with its incidence set to increase as the obesity and diabetes epidemics continue to grow. Neuropathy is caused by metabolic factors as well as by damage to the microvasculature that supplies nerve fibres.
Neuropathic pain incidence
Definitions of neuropathic pain vary across studies, leading researchers to call for a unified nomenclature. The best evidence on incidence comes from studies of neuropathic pain linked to specific conditions, but even then ranges can vary widely1.
Price of pain
Around 100 million adults in the United States are aff¬ected by chronic pain in a single year. The annual total cost of pain, including direct costs, decreased wages and lost productivity, eclipses that of any other condition2.
Health-care spending on back problems in the United States more than doubled between 1987 and 2000. Although treatment costs and population increases contributed, most of the $9.5-billion rise was due to an increase in the prevalence of back pain3.
1. van Hecke, O. et al. Pain 155, 654–662 (2014). 2. Inst. Medicine Relieving Pain in America (National Academy of Sciences, 2011). 3. Thorpe, K. E. et al. Health Affairs http://dx.doi.org/10.1377/hlthaff.w4.437 (2004).
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Holmes, D. The pain drain. Nature 535, S2–S3 (2016). https://doi.org/10.1038/535S2a
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