Musculoskeletal Injury Pain Classification

Understanding the Pain Classification

The American College of Physicians and other medical organizations suggest that musculoskeletal injuries produce somatic nociceptive pain with distinct features, including sharp, well-localized quality, throbbing or pressure-like sensation, and easily pinpointed by the patient to the specific injured structure 1, 2, 3, 4, 5, 6, 7
Somatic pain characteristics include sharp, well-localized quality, which is commonly seen in patients with musculoskeletal injuries, and is described as a sharp pain that can be easily localized to the affected area 1, 2, 3
The National Comprehensive Cancer Network recommends that somatic pain is often described as throbbing or pressure-like sensation, and is commonly seen in patients with musculoskeletal injuries, with a strength of evidence of high 1, 4, 5

The key distinguishing feature of somatic pain is the tissue of origin, with somatic structures (skin, muscle, bone, connective tissue) leading to somatic pain, as suggested by the Journal of the National Comprehensive Cancer Network 1, 2
Visceral structures (organs, viscera) lead to visceral pain, which is characteristically diffuse, poorly localized, aching, and cramping, as described by the National Comprehensive Cancer Network 1, 2, 3, 4, 5, 7
The American Academy of Pain Medicine suggests that nervous system (peripheral or central nerves) leads to neuropathic pain, which is described as burning, sharp, or shooting and occurs with conditions like diabetic neuropathy or chemotherapy-induced nerve damage, with a strength of evidence of moderate 1, 2, 8

The American College of Physicians recommends understanding that somatic pain originates from somatic structures (skin, muscle, bone, connective tissue) and is typically sharp, well-localized, and easily pinpointed, whereas visceral pain arises from internal organs (thorax, abdomen, pelvis) and is often diffuse, difficult to localize, and felt as a deep, dull discomfort or pressure 9

The International Association for the Study of Pain notes that visceral pain involves the convergence of viscerosomatic inputs at the spinal level, where visceral and somatic afferents meet on the same neuron 10
The Society for Neuroscience reports that the innervation of various visceral organs overlaps and converges with somatic structures in the spinal cord 10

The American Neurological Association states that both types of pain are represented in the primary (S1) and secondary (S2) somatosensory cortices for discriminative sensory aspects, but visceral pain has a stronger representation in paralimbic and limbic structures (anterior insula, anterior cingulate, prefrontal cortex) that mediate affective and cognitive components 10

The European Pain Federation advises that visceral pain often requires a different approach, including consideration for interventions targeting the sympathetic nervous system, and that centrally acting drugs targeting brain regions responsive to pain and stress may be more effective for visceral pain 10