Theoretical Medicine

, Volume 12, Issue 3, pp 193–211

Pain, suffering, and anxiety in animals and humans

  • David DeGrazia
  • Andrew Rowan


We attempt to bring the concepts of pain, suffering, and anxiety into sufficient focus to make them serviceable for empirical investigation. The common-sense view that many animals experience these phenomena is supported by empirical and philosophical arguments. We conclude, first, that pain, suffering, and anxiety are different conceptually and as phenomena, and should not be conflated. Second, suffering can be the result — or perhaps take the form — of a variety of states including pain, anxiety, fear, and boredom. Third, pain and nociception are not equivalent and should be carefully distinguished. Fourth, nociception can explain the behavior of insects and perhaps other invertebrates (except possibly the cephalopods). Fifth, a behavioral inhibition system associated with anxiety in humans seems to be present in mammals and most or all other vertebrates. Based on neurochemical and behavioral evidence, it seems parsimonious to claim that these animals are capable of experiencing anxious states.

Key words

animal anxiety nociception pain suffering 


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Copyright information

© Kluwer Academic Publishers 1991

Authors and Affiliations

  • David DeGrazia
    • 1
  • Andrew Rowan
    • 2
  1. 1.Department of PhilosophyThe George Washington UniversityWashington DCUSA
  2. 2.Tufts Center for Animal and Public PolicyTufts University School of Veteriary MedicineNorth GraftonUSA

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