Recognizing Pain in Pigs: Indicators and Assessment

Accurate pain recognition in pigs is essential for timely treatment on farms and in research settings, yet remains underused in practice.

Key Facts

Pigs have a similar pain neuroanatomy to humans and experience both acute and chronic pain
The Pig Grimace Scale uses facial expressions (eye closure, nose wrinkling, ear position) to score pain
Lame pigs on farms are frequently not treated, partly because mild lameness is difficult to detect
Post-surgical pain management on farms remains inadequate in most countries
Chronic pain from joint disease, abscess, and injury affects a significant minority of commercial pigs
Research shows pain reduces feed intake, growth rate, and reproductive performance significantly

Welfare Considerations

Pain recognition in pigs has historically lagged behind that for companion animals, leaving farm pigs undertreated. Scientific advances — particularly the Pig Grimace Scale and automated gait analysis — now provide objective, practical tools for producers and veterinarians. Implementing routine pain assessment protocols improves both welfare and productivity, since painful pigs grow more slowly and have higher mortality rates. Legislative standards in some countries now require pain relief for routine procedures like castration, but enforcement is inconsistent.

What You Can Do

Support organizations training farm workers in pig pain recognition techniques
Advocate for legislation requiring analgesic use during routine pig husbandry procedures
Choose pork products certified by welfare standards that include pain management protocols
Fund research into low-cost, on-farm pain assessment tools for commercial pig producers