Scientific approaches to recognizing and measuring pain in pigs, including the Pig Grimace Scale, behavioral indicators, and implications for treatment and management decisions.
Pain recognition and management in pigs has advanced substantially through development of validated assessment tools and growing understanding of porcine nociceptive biology. The Pig Grimace Scale allows rapid, non-invasive pain scoring based on ear position, orbital tightening, snout shape, cheek tension, and forehead wrinkling — changes that occur reliably in response to pain states. Despite these advances, pain management in commercial pig production remains inadequate: routine painful procedures including castration and tail docking are performed without analgesia across large portions of the industry, and lameness — affecting up to 30% of breeding sows in some production systems — is chronically underrecognized and undertreated. Veterinary attention must shift toward proactive pain assessment using validated tools at regular intervals, mandatory analgesia protocols for all procedural pain, and infrastructure that allows early detection of lameness before it becomes severe. Consumer and regulatory pressure for analgesia use during painful procedures is one of the most direct levers for improving porcine pain management at scale.