Cats are masters at hiding pain — a natural instinct that helped their wild ancestors avoid appearing vulnerable to predators. Unfortunately, this makes it challenging for cat owners to recognize when their feline friend is uncomfortable. To help with this, veterinary researchers developed the Feline Grimace Scale (FGS), a scientific tool designed to identify pain in cats through subtle changes in facial expressions.
What Is the Feline Grimace Scale?
The Feline Grimace Scale was created in 2019 by Dr. Paulo Steagall and his team at the University of Montreal. By observing cats before and after routine procedures (such as spaying and neutering), the researchers identified five key facial features that change consistently when a cat is in pain. These are known as facial action units.
The Five Facial Indicators
1. Ears
Ears turned outward or flattened against the head may signal discomfort.
2. Eyes
Squinting or partially closed eyes often indicate tension or pain.
3. Muzzle
A tightened, drawn-back muzzle suggests strain or distress.
4. Whiskers
Whiskers pushed forward or pinned down can signal stress or unease.
5. Head Position
A lowered or tucked head often indicates the cat feels unwell or fatigued.
How the Feline Grimace Scale Works
Each of the five facial features is scored individually using a three-point system:
- 0 = Normal (no pain)
- 1 = Moderate (possible mild discomfort)
- 2 = Obvious (clear signs of pain)
The scores are added together for a total score out of 10 (5 features × 2 points).
Feline Grimace Scale Scoring Guide
| Total Score | Pain Level | Interpretation |
|---|---|---|
| 0–2 | No or minimal pain | Relaxed, comfortable cat |
| 3–5 | Mild to moderate pain | Monitor closely; mild treatment may help |
| 6–10 | Significant pain | Veterinary care strongly recommended |
How It’s Used
Veterinarians use the Feline Grimace Scale as a reliable, objective tool to assess pain — especially after surgery, injury, or illness. Many shelters and rescue centers also use it to monitor newly admitted or recovering cats.
Cat owners can apply the FGS at home as well. If your cat repeatedly shows signs such as squinting eyes, flattened ears, or a tight muzzle, it may be a sign of discomfort. In this case, a vet visit is recommended.
Why the Feline Grimace Scale Matters
Cats rarely show pain in dramatic ways — they may not cry, limp, or vocalize until discomfort is severe. That’s why recognizing small facial changes is so important. The Feline Grimace Scale helps bridge the communication gap, allowing you to identify pain earlier, support your cat’s comfort, and seek veterinary care sooner.
0 = No discomfort
Ears facing forward
Muzzle relax (round shape)
Whiskers loose and curved
Head above the shoulder
line
1= Moderate
Ears slightly pulled apart
Eyes partially opened
Muzzle mildly tense
Whiskers slightly curved
or straight
Head aligned with the
shoulder line
2 = severe
Ears flattened and rotated
outwards
Squinted eyes
Muzzle tense
Whiskers straight and
moving forward
Head below the shoulder
line or tilted down (chin
towards the chest)
💡 Tip: If your cat shows several of these signs, or you suspect they’re in pain, contact your vet right away. Early detection makes a huge difference in treatment and comfort.
If you’d like to understand your cat even better, facial cues are only one part of the picture. Body posture, tail movement, and overall behavior reveal just as much. To learn how to read these signs, explore my full guide on cat body language, which pairs perfectly with the Feline Grimace Scale for a complete understanding of your cat’s communication.
Conclusion
Recognizing pain early can make all the difference in your cat’s health and comfort. The Feline Grimace Scale gives you a simple, reliable way to interpret the subtle facial cues your cat may show when they aren’t feeling well. By combining this tool with your knowledge of body language and daily behavior changes, you can catch pain sooner, seek timely veterinary care, and ensure your cat stays happy, healthy, and understood.
To help you learn even more about keeping your cat healthy, here are some of my other guides you may find useful:
- How I Beat My Cat Allergy Without Giving Up on My Cats
- Feline Leukemia Virus (FeLV): Symptoms, Transmission & Prevention
- 10 Common Health Issues in Cats and How to Prevent Them
- Why Dental Care Is Essential for Your Pet’s Health
- The Ultimate Guide To Cat Body Language
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