Farmed Pig Pain Recognition Science

Advances in pig pain recognition science are transforming how farms identify and treat pain, reducing unrecognized suffering across one of the world's most farmed species.

Key Facts

Pigs have similar pain neuroanatomy to humans and show measurable pain responses to noxious stimuli
The Pig Grimace Scale, developed from facial action coding research, allows pain assessment from photographs
Lameness scoring systems help identify pigs with musculoskeletal pain requiring intervention
Castration without analgesia is still practiced in many countries despite evidence of severe acute pain
EU and UK guidelines increasingly require pain relief for routine husbandry procedures in pigs

Welfare Considerations

Historically, pig pain was underdiagnosed because pigs, like many prey species, mask pain behavior to avoid appearing vulnerable. The Pig Grimace Scale and validated lameness scoring have democratized pain recognition, enabling farm staff to identify pain without specialist veterinary training. When combined with treatment protocols using appropriate analgesics, these tools dramatically reduce the duration of unrecognized suffering. The welfare impact of routine pain-free husbandry - castration with analgesia, prompt lameness treatment, post-procedure monitoring - compounds across millions of pigs in intensive systems.

What You Can Do

Support national and international policies requiring analgesia for pig castration and tail docking
Advocate for the adoption of validated pig pain scoring tools including the Pig Grimace Scale on farms
Donate to pig welfare research organizations developing better pain assessment and treatment protocols
Choose pork certified under welfare schemes that specify pain relief for husbandry procedures