Cats are experts at hiding pain, which makes the hours and days after surgery stressful for owners trying to figure out if their pet is comfortable. The good news is that cats do give off reliable signals when they’re hurting. You just need to know where to look: their face, their posture, their habits, and their willingness to move. Here’s how to read those signals clearly.
Watch Your Cat’s Face First
A cat’s facial expression is one of the most reliable windows into its pain level. Veterinary researchers developed a tool called the Feline Grimace Scale that scores five specific features of a cat’s face, and all five are significantly more pronounced in cats experiencing pain compared to pain-free cats. You don’t need formal training to spot the basics.
The key things to watch for are ears that rotate outward and flatten rather than sitting upright, eyes that appear squinted or partially closed (the area around the eye socket tightens), and whiskers that bunch together or push forward and away from the face instead of relaxing in their normal fan shape. The muzzle area may also look tense, with a more oval or flattened appearance rather than the soft, round shape of a relaxed cat. If you see several of these changes at once, your cat is likely uncomfortable.
Posture and Body Position
A cat in post-surgical pain often adopts a hunched or crouched posture, leaning forward with shoulders raised and head held low. The front and back legs may be tucked tightly underneath the body rather than stretched out. This is especially common after abdominal procedures like spays. A comfortable cat will eventually settle into more relaxed positions: lying on its side, stretching out, or curling up loosely.
Complete stillness can also be a red flag. A cat that seems unresponsive and immobile, showing no interest in its surroundings, isn’t necessarily “resting well.” That kind of shutdown, where the cat doesn’t investigate noises or movement around it, can indicate significant discomfort or distress.
Changes in Sound and Sociability
Some cats become more vocal when they’re hurting, but not always in the way you’d expect. Rather than meowing, a cat in pain is more likely to growl (a low, throaty rumble with the mouth closed) or hiss when you approach. Some cats become unusually quiet instead. The change from their normal pattern matters more than the specific sound.
How your cat reacts to you is another important clue. A cat in pain may withdraw completely, hiding under furniture and refusing to engage. Others go the opposite direction, becoming aggressive or defensive when approached, biting, swatting, or bristling their fur. If your normally friendly cat suddenly wants nothing to do with you, or your independent cat won’t stop crying, pain is a likely cause.
Eating, Drinking, and Litter Box Habits
It’s normal for a cat to skip a meal or eat lightly in the first 12 to 24 hours after surgery, partly due to lingering anesthesia effects and nausea. But a cat that still isn’t eating by the second day may be telling you something. Pain suppresses appetite directly, and cats can develop food aversions quickly if they associate eating with feeling bad. Track what your cat actually consumes each day rather than just checking whether the food bowl looks emptier.
If your cat hasn’t eaten adequate amounts within three to five days (counting any pre-surgery fasting), that’s a serious nutritional concern that needs veterinary attention regardless of the cause.
Litter box avoidance is another signal that’s easy to miss or misinterpret. If surgery involved the abdomen, back, or legs, the simple act of squatting or climbing over the sides of the box can be painful. You might notice your cat approaching the box and then walking away, or eliminating outside it. Straining to urinate or defecate is a more urgent sign that could point to both pain and post-operative complications. Switching to a low-sided box and placing it somewhere your cat doesn’t have to travel far can help you figure out whether the problem is pain-related or something else.
How Your Cat Moves (or Doesn’t)
Reluctance to jump is one of the clearest mobility signs of pain. A cat that normally hops onto counters or beds but now hesitates, crouches at the base, or only jumps partway is likely guarding a painful area. Other movement changes to watch for include difficulty going up or down stairs, a stiff or uneven gait, reluctance to run or play, and shifting posture during activities that used to be effortless.
Some degree of reduced activity is expected after any surgery. The concern is when a cat that should be gradually returning to normal movement over the first few days remains stiff, hesitant, or unwilling to move at all.
Grooming the Surgical Area
Gentle licking near a wound can be normal cleaning behavior, but excessive licking, nibbling, biting, or chewing focused on one specific spot often signals pain or irritation. Pain and itch travel along similar nerve pathways, and cats instinctively try to soothe discomfort through grooming. If your cat is obsessively attending to the incision area or a nearby body part, that localized focus is worth noting as a pain indicator, and it can also compromise healing.
What the Incision Should (and Shouldn’t) Look Like
Some redness and mild swelling around an incision in the first day or two is part of normal healing. What you’re watching for are signs that inflammation is turning into something more painful. Heat radiating from the area, increasing swelling rather than decreasing, discharge that’s thick or foul-smelling, or skin that looks puffy and tight all suggest infection or fluid buildup. A cat with a developing infection will often develop a fever, becoming lethargic and warm to the touch. If swelling at the incision site is growing rather than shrinking by days three to four, that’s a problem that needs attention.
Pain vs. Medication Side Effects
This is a distinction that trips up many owners. Cats recovering from surgery are often given opioid-based pain medications, which can cause a side effect called dysphoria: a state of agitation, restlessness, and vocal distress that looks a lot like pain but has a completely different cause and needs a different response.
A dysphoric cat is vocal, disruptive, and impossible to console. You may notice visible third eyelids (the pale membrane in the inner corner of the eye partially covering the eyeball), a slower than normal heart rate, and zero interest in food or water. The key difference: a dysphoric cat doesn’t respond to gentle interaction or soothing, and it doesn’t flinch or react when you carefully touch near the surgical site. A cat in pain, by contrast, typically reacts to pressure or touch near the affected area.
This matters because giving a sedative to a dysphoric cat doesn’t fix the problem and can make it worse. If your cat is acting distressed and you can’t tell whether it’s pain or a drug reaction, the safest approach is to contact your vet. They may adjust the medication rather than add more of it.
Breathing and Heart Rate
A healthy cat at rest breathes fewer than 30 times per minute. After surgery, the average respiratory rate tends to run slightly higher, around 34 breaths per minute. Consistently fast or shallow breathing, panting, or breathing that looks labored can signal pain, though it can also reflect anxiety or other complications.
Heart rate and breathing rate alone aren’t reliable standalone indicators of pain in cats. Veterinary guidelines note that these vital signs haven’t been consistently correlated with pain levels the way behavioral signs have. They’re worth monitoring as part of the bigger picture, but a cat with a normal heart rate can still be in significant pain.
Tracking Changes Over Time
The most useful thing you can do is compare your cat’s behavior now to what’s normal for them. A cat that’s always quiet and independent will show pain differently than one that’s usually social and vocal. The American Animal Hospital Association recommends that owners focus specifically on changes they’ve noticed in their cat’s behavior, mood, and daily activities. Recording short videos of your cat at home can be especially helpful, since cats often behave differently at the vet clinic. Many veterinarians will review home footage to help assess whether pain management needs adjusting.
In the first 24 hours, expect grogginess, reduced appetite, and limited movement. By days two and three, you should see gradual improvement: more interest in surroundings, some appetite returning, and willingness to shift positions. If your cat seems to plateau or regress, with worsening facial tension, continued refusal to eat, escalating withdrawal, or increasing stiffness, that pattern suggests pain isn’t being adequately controlled.