Domestic Cats (Felis catus) are the only common companion animal that is both a predator and, at 8 to 10 pounds, plausible prey, and that double inheritance explains why pain in this species goes unrecognized so often. A cat in discomfort still eats from habit, still sleeps its 12 to 16 daily hours, and still greets its person at the door, while quietly abandoning the jumps, the grooming sessions, and the games it can no longer manage. Pain recognition matters across a 12 to 18 year lifespan because the conditions that cause it, arthritis and dental disease above all, become close to universal in the final third of a cat's life, and relief depends first on somebody at home noticing.
Why Cats Hide Pain
The instinct is survival arithmetic from the species' wild past. A solitary hunter that advertises weakness invites rivals onto its hunting ground and predators toward its den, so the ancestors who survived were the ones who looked fine for as long as physically possible. Domestication kept the body and the instinct while deleting the danger, and the modern house cat still defaults to concealment. Pain in a cat therefore arrives as absence rather than complaint: the jump no longer attempted, the grooming skipped, the greeting shortened. Vocalizing is a late sign, and a cat that cries out has usually been hurting for a long time already.
Absence, Not Complaint
That reframing changes what owners watch for. Waiting for limping or crying means waiting for the final visible stage of something the cat has compensated around for months. The early record is written in what has disappeared from the cat's ordinary Tuesday: the counter it no longer visits, the stretch before the afternoon nap, the indignation at the brush. Crepuscular by nature, a cat that once held its dawn and dusk patrols and now sleeps through them has dropped the clearest absence of all, because activity peaks are among the last habits pain allows to continue. A cat that seems fine but has stopped doing the things it loved is not fine, and the absence is the symptom.
The Signs That Reveal Pain
The evidence collects in three clusters, physical, behavioral, and relational, and any single sign earns attention while several together justify a call to the clinic.
Posture and Movement
Painful cats hold themselves differently: a hunched crouch with the head lowered, a loaf position that looks tense rather than relaxed, eyes narrowed, ears rotated outward or flat. Movement changes more slowly but more reliably: rising is slow and careful, strides shorten, stairs are taken in deliberate steps or avoided, and a limp that appears only after the cat has been resting points at joints that stiffen between uses. The signature sign, though, is vertical. Cats travel their world by jumping, and a cat that hesitates before a jump it once made without thinking, or that now reaches its favorite perch by way of a chair, is reporting joint pain in the only language it has.
Coat, Appetite, and Temperament
Grooming is the first luxury a painful cat cancels, because twisting to reach the spine and hips hurts. The result is a coat that turns greasy or flaky, mats forming along the lower back, and claws that thicken from underuse. Appetite drops or becomes selective, since reaching the bowl may itself be painful. Temperament shifts toward irritability: growling when touched on a specific spot, swatting when lifted, abandoning the lap that was once routine, and hiding for more hours of the day than before. Litter box habits can change too, because a high-sided box demands an arthritic hop, and accidents outside the box in a senior cat are as often a mobility complaint as a bladder one.
Acute and Chronic Pain
The two forms announce themselves differently. Acute pain has a recent cause, an injury, a surgical incision, a burned paw, and its signs are comparatively loud: guarding a body part, refusing to bear weight, hissing when the area is approached. Chronic pain builds over months and years, and the cat adapts to it in stages so small that no single day marks a change. Chronic pain in cats is a behavioral disease more than a postural one, visible in the abandoned jump and the shortened play session rather than in any cry, and it is by far the more commonly missed of the two.
Why Chronic Pain Is Missed
The disguise is age itself. A household watches a cat slow down across several years and files each small surrender under "getting old," a category that sounds like a diagnosis and justifies nothing. Old age is not a disease, and slowing down is not its symptom but a description. The underlying causes, degenerative joint disease above all, are specific, common, and treatable, which is why the cats most likely to be living with untreated pain are the ones whose families describe them as "just slowing down."
Where Feline Pain Concentrates
Untreated pain, when it comes, tends to live in a few predictable places, and knowing the shortlist sharpens what an owner watches for.
Arthritis and the Joints
Degenerative joint disease is the senior cat's most common pain source, with radiographic evidence found in a majority of cats past 12 years of age, and the spine and hips carry most of it. Because cats jump rather than walk through their territory, joint pain shows up vertically first, in the hesitations and detours described above, long before any limp appears on a flat floor. The disease also hides in the physics of the animal: roughly 230 bones and a free-floating clavicle give a cat extraordinary flexibility, and flexibility is exactly what lets a stiff cat keep compensating until the compensation itself becomes the sign.
The Mouth
Dental disease rivals arthritis in frequency. Beyond the tartar and gum inflammation familiar in other species, cats carry a lesion of their own: tooth resorption, in which the body dissolves a tooth from the outside or the inside, exposing nerve. Cats also eat through oral pain with particular commitment; an obligate carnivore will often keep crunching kibble with a splitting carnassial tooth, so a full food bowl proves nothing about a comfortable mouth. Dropping food, chewing on one side, and foul breath are the usable clues.
The Back and the Abdomen
Spinal pain from intervertebral disc disease or injury produces reluctance to jump combined with a tense, guarded back and sometimes a hunched posture. Abdominal pain carries a wider list: pancreatitis, constipation, and urinary disease among them, and one form is an emergency without qualification. A male cat straining unproductively in the litter box, crying, or licking at the penis may have a urethral obstruction, which becomes fatal within a day or two and needs a hospital, not a wait-and-see.
Assessment, Relief, and the Senior Standard
What the Pain Assessment Asks
The examination combines the owner's observations with the clinician's hands. The history questions track exactly the absences described above: which jumps have stopped, how grooming looks, whether the cat hesitates at stairs, how appetite, litter habits, and sociability are running. Then comes gait observation, palpation along the spine and each joint, and flexibility checks that look for the flinch or the withdrawal. Bloodwork usually accompanies the visit, less to find pain itself than to rule the metabolic impostors in or out before relief is prescribed. Home video is valuable here because clinic cats perform their best behavior, and a thirty-second clip of the cat approaching the stairs often shows what the exam table cannot.
Relief Is Prescription Only
Effective pain relief for cats comes through a veterinarian. Human painkillers are not small-dose cat medicine: acetaminophen is fatal to cats even in small amounts, and ibuprofen damages feline kidneys and stomach lining at doses humans consider trivial. Doses extrapolated from dogs are also unsafe, because cats clear drugs on their own metabolic schedule. Veterinary analgesics exist specifically for feline physiology, including options approved for long-term use in chronic arthritis, and they are chosen alongside the cat's other conditions rather than prescribed blind.
The Senior Pain Conversation
The conversation belongs at every senior checkup, and it works best when the owner arrives with observations rather than a vague worry: the specific perch abandoned, the grooming that stopped in March, the litter box that gained an accident. This matters doubly in the senior years because the trio of kidney disease, hyperthyroidism, and diabetes shapes which pain medications are safe, and the conditions interact; an arthritic cat in pain may drink less because reaching the water bowl hurts, which strains already compromised kidneys. Pain management for senior cats is coordinated medicine, not a single prescription.
Veterinary medicine has formally recognized the stakes as a standards question rather than a courtesy, with professional associations classifying pain assessment and relief as a required standard of care alongside vaccination and parasite control. For a species engineered by its own history to look fine, that standard exists because the patient cannot advocate for itself and the humans around it must. The cat will never describe its pain, but it will always demonstrate it, in the jump not taken and the perch left empty. Hearing that demonstration, treating it as medical information rather than aging, and acting on it with prescription relief is the difference between a long life and a livable one, and for an animal that shares 12 to 18 years with its household, the difference is worth every appointment it takes to secure.