Cats are experts at hiding discomfort. An animal companion may continue eating, grooming, or using the litter box while experiencing pain from dental disease, arthritis, injury, urinary problems, or another medical condition.
The Feline Grimace Scale helps you recognize five subtle facial signals of acute pain, but it is a screening tool: not a diagnosis. If your cat’s expression or behavior changes suddenly, contact your veterinarian.
Learning what “normal” looks like for your cat can help you notice small changes sooner. Early attention may lead to earlier veterinary diagnostics, faster treatment, and less suffering for your pet.
What is the Feline Grimace Scale?
The Feline Grimace Scale is a validated veterinary tool used to assess acute pain in cats. It looks at five facial action units, or specific changes in facial appearance and head position:
- Ear position
- Orbital tightening, meaning narrowing around the eyes
- Muzzle tension
- Whisker position
- Head position
Each action unit receives a score from 0 to 2:
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0: No obvious sign of pain
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1: A moderate or uncertain change
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2: A clear pain-related change
The five scores can add up to a total of 10. The original validation study, published in Scientific Reports, found that higher scores were associated with pain and that scores decreased after pain relief.
The scale can be useful at home, especially when you compare your cat with their usual relaxed appearance. However, fear, stress, sleepiness, illness, and environmental changes can also affect facial expression. Never use a score to delay urgent veterinary care.
1. Are your cat’s ears rotated outward or flattened?
A healthy, relaxed cat may hold their ears forward or gently move them toward interesting sounds. Pain can change this position.
Watch for ears that are:
- Pulled apart rather than facing forward
- Rotated outward
- Flattened or held low against the head
- Less responsive to sounds and movement
- Held in a tense, fixed position
A moderate change may be difficult to interpret. One ear may move because your cat heard something nearby. The concern is greater when both ears remain outward or flattened while your cat is otherwise quiet and withdrawn.
Ear position can also change with fear or agitation. Look at the entire face and body instead of relying on one sign alone.
2. Do your cat’s eyes look narrowed or tense?
Orbital tightening refers to narrowing around the eyes. In plain English, your cat may appear to squint.
Possible signs include:
- Eyes that are partially closed
- A narrow eye opening
- Tight skin around the eyes
- Frequent squinting
- Eyes that appear closed even though your cat is awake
Cats may squint because of pain in the eye itself, but facial tension can also occur with pain elsewhere in the body. Bright light, sleepiness, and eye irritation may produce similar changes.
Take note of your cat’s normal expression. Some cats naturally have narrow-looking eyes, while others appear wide-eyed most of the time. A change from your cat’s baseline matters more than a single photograph.
If your cat has a red, cloudy, swollen, or suddenly closed eye, seek veterinary care promptly. Eye problems can worsen quickly.
3. Does the muzzle look tight instead of rounded?
A relaxed feline muzzle usually has a soft, rounded appearance. With pain, the muzzle may look tense, flattened, or stretched.
You may notice:
- A more elongated or oval-shaped muzzle
- Tightness around the nose and mouth
- A flattened appearance
- Less relaxed facial movement
- A tense lower face when your cat is resting
Muzzle tension can be subtle, particularly in long-haired cats or cats with naturally distinctive facial features. Try observing your cat from the front and side without touching their face.
Dental pain is one possible reason for facial tension. Cats with oral discomfort may also drool, drop food, chew on one side, avoid hard food, or resist having their mouth handled. Some cats show none of these obvious signs.
A cat health test cannot replace an oral examination. If you suspect tooth or mouth pain, ask your veterinarian to examine your cat’s teeth, gums, tongue, and jaw.
4. Are your cat’s whiskers pushed forward or held stiffly?
Whiskers are highly sensitive structures that help cats understand their surroundings. Their position changes with mood, attention, and discomfort.
Pain-related whisker changes may include whiskers that are:
- Straighter than usual
- Pushed forward and away from the face
- Stiff or “spiked” in appearance
- Less loosely curved along the cheeks
- Held in a fixed position
Whiskers naturally move when your cat is hunting, playing, watching a bird, or reacting to a new sound. Forward whiskers alone do not prove that your cat is in pain.
The signal becomes more meaningful when it appears alongside narrowed eyes, tense ears, a tight muzzle, and a lowered head. A combination of changes is more concerning than one isolated feature.
Avoid trimming or pulling whiskers. They are important sensory tools, and handling them may increase stress.
5. Is your cat holding their head lower than usual?
Head position is the fifth facial action unit in the Feline Grimace Scale. A cat experiencing pain may hold their head below the shoulder line or angle the chin toward the chest.
Look for:
- A head held lower than normal
- The chin tilted toward the chest
- A reluctance to lift the head
- A guarded or hunched posture
- Less interest in looking around
This sign is easier to recognize when your cat is awake and resting. A sleeping cat may naturally lower their head, so do not score a sleeping position as evidence of pain.
Body posture provides important supporting information. Your cat may sit tucked up, move less, hide more often, or avoid jumping onto familiar surfaces. These changes are not technically separate Feline Grimace Scale action units, but they can strengthen your concern when they occur with facial changes.
How can you use the scale without increasing your cat’s stress?
Observation is most useful when your cat is calm. Do not restrain your cat or repeatedly reposition their face to obtain a better view.
Try these steps:
- Watch from a quiet distance.
- Observe your cat when they are awake and resting.
- Compare their face with older photos from relaxed moments.
- Look at all five facial action units together.
- Note appetite, drinking, litter box use, movement, grooming, and hiding.
- Take a short video to share with your veterinarian.
- Contact your veterinary team if the changes persist, worsen, or appear suddenly.
The Feline Grimace Scale was developed primarily for acute pain assessment. It may be less useful for identifying every type of chronic discomfort, and it cannot tell you what is causing the pain.
Why do at-home cat health tests matter when cats hide illness?
Cats often conceal illness until a problem has progressed. A convenient cat health test can support preventive care by giving you useful medical information without adding the stress of a clinic visit.
Affordable Pet Labs offers cat in-home and mail-in testing options, along with home-collection services. Depending on your cat’s needs, veterinary diagnostics may help evaluate concerns involving:
- Urinary health
- Digestive health
- Parasites
- Organ function
- General wellness
- Changes identified during a veterinary examination
For example, an at-home fecal test can help screen for intestinal parasites. A urine-based evaluation may provide information about urinary health. Bloodwork can help assess internal organ function and identify abnormalities that are not visible from the outside.
These tests do not diagnose pain by themselves. They also cannot rule out every painful condition. A cat may have normal laboratory results and still need an examination for dental, orthopedic, neurologic, or other problems.
Testing is most helpful when it is part of a broader care plan. You can learn how the Affordable Pet Labs process works, share results with your veterinarian, and keep records to compare over time.
When should you seek immediate veterinary care?
Do not wait to calculate a grimace score if your cat appears seriously ill or distressed. Contact a veterinarian immediately for signs such as:
- Trouble breathing
- Collapse or severe weakness
- Uncontrolled bleeding
- Repeated vomiting
- A swollen or painful abdomen
- Inability to urinate
- Straining in the litter box with little or no urine
- Sudden paralysis or inability to walk
- A serious injury
- Severe or rapidly worsening pain
- Extreme confusion or unresponsiveness
Urinary blockage is a particular emergency in cats, especially males. Straining, frequent litter box visits, vocalizing, or producing only drops of urine requires urgent attention.
For non-emergency concerns, you can order available tests and ask your veterinarian which veterinary diagnostics are appropriate. Affordable testing can help make preventive monitoring more accessible, but it should complement: not replace: professional medical care.
What should you remember about subtle pain in cats?
Cats do not always cry, limp, or stop eating when they hurt. Their discomfort may first appear as a small change in expression or posture.
Look for the five Feline Grimace Scale signals:
- Ears rotated outward or flattened
- Eyes narrowed by orbital tightening
- A tense or elongated muzzle
- Whiskers pushed forward or held stiffly
- A head held below the shoulder line
Your careful observation is an important part of protecting your cat, and timely veterinary diagnostics can help identify underlying health problems before they become harder to manage. When something seems different, trust your knowledge of your animal companion and reach out for guidance.
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