Cats are hardwired to hide pain. In the wild, showing weakness makes an animal a target, and domestic cats retain that instinct. So if you’re noticing something “off” about your cat, that change is worth taking seriously, even if it seems small. The signs of suffering in cats are often subtle shifts in routine behavior rather than obvious distress signals.
Behavioral Changes That Signal Pain
An expert consensus study published in PLOS One identified several behaviors considered strong enough on their own to indicate a cat is in pain. These include withdrawing or hiding, stopping grooming, becoming reluctant to move, and a noticeable drop in overall activity. If your cat is doing any of these things and it’s a departure from normal, pain is a likely explanation.
Other behaviors show up frequently in cats experiencing pain but aren’t as definitive on their own. Sleeping more than usual, excessive grooming of one area (which can indicate localized pain), and hiding inside the litter box all fall into this category. They’re worth noting, especially when they appear alongside other changes.
One of the most reliable early warnings is a shift in your cat’s interest in the world. A cat that used to greet you at the door, watch birds from the window, or bat at toys but now seems indifferent to all of it may be dealing with chronic discomfort. This general loss of engagement is easy to dismiss as aging or moodiness, but veterinary research consistently links it to pain conditions like osteoarthritis.
Reading Your Cat’s Face
Researchers developed the Feline Grimace Scale to help identify pain through five specific facial changes: ear position (ears flatten or rotate outward), orbital tightening (eyes narrow into a squint), muzzle tension (the area around the nose and mouth looks tight or bunched), whisker position (whiskers pull forward and become stiff rather than relaxed), and head position (the head drops below the shoulder line). You don’t need to score these formally. Just knowing what to look for gives you a more reliable read on your cat’s state than guessing from body language alone.
Mobility Problems Are Easy to Miss
Cats with joint pain rarely limp the way dogs do. Instead, they adapt. A cat that used to leap onto the counter in one motion might start using a chair as an intermediate step. Movements that were once fluid start looking stiff or hesitant. You might notice your cat has stopped jumping onto the bed entirely, or that it no longer grooms its lower back because twisting hurts.
Litter box problems are another common sign. A cat that starts urinating or defecating outside the box may be struggling to climb in and out, not acting out. This is especially common in older cats with osteoarthritis, which affects a surprisingly high percentage of cats over age 12. If your senior cat suddenly breaks its litter box habits, pain should be one of the first things you consider.
Appetite Loss and What It Means
A cat refusing food is one of the most common reasons owners seek veterinary care, and for good reason. Chronic pain frequently reduces appetite. So do oral problems like dental disease, which cause pain when chewing or swallowing. Cats that associate eating with discomfort will simply stop.
Appetite loss can also signal systemic illness, including kidney disease, diabetes complications, cancer, or infections causing fever. Regardless of the underlying cause, a cat that won’t eat for more than 24 to 48 hours needs veterinary attention. Cats are uniquely vulnerable to a dangerous liver condition that develops when they go without food for too long.
Purring Doesn’t Mean Everything Is Fine
This catches many owners off guard. Cats purr when they’re content, but they also purr when they’re in pain, frightened, or dying. Purring appears to be a self-soothing behavior, similar to how a person in distress might rock back and forth. The vibrations, which occur at frequencies between 25 and 150 Hertz, may trigger the release of natural pain-relieving chemicals and promote tissue repair. So a purring cat curled up in your lap could be happy, or it could be trying to manage pain. Look at the full picture rather than treating purring as an all-clear signal.
Signs of Serious or End-Stage Suffering
Some signs indicate a cat is in severe distress or actively declining. These include labored or open-mouth breathing, significant weight loss, sunken eyes, dehydration (you can check by gently pinching the skin at the scruff; if it doesn’t snap back quickly, the cat is likely dehydrated), low body temperature (the ears and paws feel cold), and an inability to stand or move on its own. Increased vocalization, especially at night or in unusual tones, can indicate confusion, pain, or both.
Vomiting and diarrhea that persist beyond a day, sudden clumsiness or disorientation, and abnormal aggression in an otherwise gentle cat are also red flags. A cat that was never aggressive but now hisses or swipes when touched in a specific area is telling you that area hurts.
How to Assess Your Cat’s Quality of Life
Veterinarians often use a framework called the HHHHHMM scale to help owners evaluate quality of life. It covers seven areas, each scored on a scale of 1 to 10:
- Hurt: Is your cat in pain or having difficulty breathing? Pain management is the single most important factor in quality of life.
- Hunger: Can your cat eat on its own? Cats that can’t or won’t eat face rapid health decline.
- Hydration: Is your cat drinking enough water, or showing signs of dehydration?
- Hygiene: Can your cat keep itself clean? Is its coat matted? Can it control urination and defecation?
- Happiness: Does your cat still enjoy anything? Is it responsive and willing to interact with you?
- Mobility: Can your cat move around on its own, or does it need help reaching food, water, and the litter box?
- More good days than bad: When bad days start outnumbering good ones, quality of life is declining in a meaningful way.
You don’t need to calculate a formal score. Simply thinking through each category honestly gives you a clearer picture than relying on gut feeling alone. It also helps you track changes over days and weeks, which is useful when deciding whether a treatment is working or whether your cat’s condition is progressing.
What You Can Do Right Now
Start by writing down what you’ve noticed and when it started. “She stopped jumping on the bed about two weeks ago” is far more useful to a veterinarian than “she seems off.” Note changes in eating, drinking, litter box use, grooming, activity level, and social behavior. The 2022 pain management guidelines from the American Animal Hospital Association emphasize that owner observations are essential for identifying chronic pain, because cats often behave normally during short veterinary visits.
Chronic pain in cats is highly treatable when caught early. Options range from medications to environmental modifications like ramps, heated beds, and litter boxes with lower sides. Many cats that seemed “old and slowing down” return to something close to their normal personality once their pain is managed. The fact that you’re asking whether your cat is suffering means you’re paying attention, and that attention is the single most important thing for your cat’s wellbeing.