Arthritis in Cats: The Most Common Disease Nobody Sees

Here is the gap this page exists to close. When researchers X-rayed 100 cats over the age of twelve, 90% showed degenerative joint disease. In another study of 100 cats across all ages, the figure was 92%, and severity climbed measurably with every year of age. Now the other half of the gap: in a Japanese study of 101 cats, where three-quarters had radiographic arthritis, exactly one owner had noticed lameness. One.

Cats do not do arthritis the way dogs do. They almost never limp, they hide pain expertly, the habit our sick cat symptoms guide decodes across every illness, and the disease announces itself through small subtractions from daily life that look exactly like "just getting old." Veterinarians commonly explain the hiding as inherited caution in an animal that is both predator and prey; whatever the reason, the measurement stands. A 2025 study across five ordinary vet clinics made it uncomfortably concrete: reviewing 502 medical records built on standard exams and owner conversations, 1% of cats had any orthopedic issue noted. When the same clinics screened cats with a validated arthritis checklist instead, 39% showed at least one behavior consistent with osteoarthritis.

What to watch instead of a limp

The one prospective study built purely on clinically arthritic cats, 28 cases, found the real signature: 71% had a changed ability to jump and 67% jumped lower than before. Jumping, not limping, is the instrument. The elbow and hip were the most affected joints, and most cases had no injury behind them, just wear.

The full watch list, drawn from that study, Cornell's guidance and the validated owner questionnaires this field now uses:

• Hesitating before a jump the cat used to make without thinking, or choosing a chair as a staging post to reach the counter
• Jumping lower, or abandoning favorite high places altogether
• Trouble with stairs, or taking them one careful step at a time
• Difficulty stepping into a high-sided litter box, sometimes showing up as accidents right next to it
• A scruffy, unkempt coat in the hard-to-reach places, because grooming means bending. One of the first places arthritis shows is the coat over the lower back, because that is the last patch a cat can reach: what those flakes mean.
• Sleeping more, seeking warm spots, playing less
• Irritability when touched over the back or hips

None of these diagnoses anything on its own. Together, in a cat past ten, they are exactly the pattern a checklist finds in 39% of cats while the standard visit finds it in 1%. Bring the list to your vet; a Canadian study of 50 diagnosed cats found the owner's observations were the primary or contributing route to diagnosis in 94% of cases. You are the diagnostic instrument here.

If your stiff senior cat has also started crying at night, that overlap has its own page: night vocalization in older cats shares causes with joint pain, and our cat meowing at night guide walks the fork.

How common is it really?

The honest way to hold the numbers: the professional life-stage guidelines reconcile the studies as a range, 40 to 92% of cats showing signs associated with degenerative joint disease, much more prevalent and severe with age. X-ray findings run ahead of visible discomfort, so not every radiographic cat is a suffering cat. But Cornell's own pages carry a figure worth hearing on the younger end: some degree of arthritis in 20% of cats aged one and up. This is not exclusively a senior disease; it is a disease seniors can no longer hide.

Treatment: what exists, and the honest map of where

There is no cure for arthritis, in cats or anyone else. Management rests on pain control, weight, and the home. The drug shelf is genuinely different depending on your market, which almost no general page tells you:

Two honest notes on that table. First, the US-versus-everyone split on NSAIDs is real and old: the low-dose long-term safety study that reassured UK, Canadian and Australian regulators (40 cats, nearly six months of daily low-dose meloxicam, one adverse effect class, no kidney impairment detected) never changed the US label. Caution is not paranoia either way: an Australian case series documented acute kidney injury in 18 cats after injectable meloxicam, and kidney disease is common in exactly the senior cats who need arthritis care. If your cat has kidney disease, say so before any NSAID conversation; a pooled safety analysis of robenacoxib, 449 cats including 126 with concurrent kidney disease, found no increased adverse events versus placebo, which is why this conversation has options rather than a wall. Our kidney disease guide covers that side.

Second, Solensia deserves its numbers stated the way the peer-reviewed trial stated them, not the way the press releases did. In the pivotal 275-cat trial, treated cats improved significantly over placebo on owner-scored measures, with a number-needed-to-treat of nine on the main measure at day 56, and skin issues were the one side effect clearly more frequent in treated cats (32 of 182, versus 8 of 93 on placebo). A number-needed-to-treat of nine means real but modest: for every nine cats treated, one improves who would not have on placebo. Many owners report more than that; the trial arithmetic is the floor you can bank on. It is a genuine option, especially where NSAIDs are off the table, and it is not a miracle shot.

Supplements: the part nobody wants to hear

A 2022 systematic review pooled 72 trials of enriched diets and supplements in dogs and cats together. Its findings, honestly relayed with that mixed-species caveat attached: omega-3 fatty acids, whether as enriched diets or supplements, showed meaningful benefit. Glucosamine-chondroitin, the best-selling joint supplement on every shelf, showed what the authors called a very marked non-effect, and they recommend it no longer be used for arthritis pain in dogs or cats. If your budget has one supplement line in it, the evidence says omega-3, not the famous one.

Weight: the lever you own

In a study of 1,457 cats, obese cats were 4.9 times as likely as lean cats to develop lameness needing veterinary care. We will state the limit of the evidence plainly, because this site does: no prospective trial has yet measured whether weight loss reduces arthritis pain in cats. The association is strong, the mechanics of joint load are not controversial, and the veterinary consensus treats weight management as the most actionable thing an owner controls. Our overweight cat guide covers how to actually do it, including why crash-dieting a cat is dangerous.

The five-dollar fixes

The home matters as much as the pharmacy, and the guidelines' recommendations are mostly carpentry, offered here as practical advice rather than trial findings:

• A litter box with one low side, so stepping in stops being a hurdle. Shallower litter helps some cats, since digging can hurt.
• Steps or a ramp to the favorite sleeping spot, wide and non-slippery.
• Warm bedding where the cat already likes to sleep; stiffness is typically worst after a night of stillness.
• Food and water where no jump or staircase guards them.

What to take away

• Radiographic studies find degenerative joint disease in about 90% of cats over 12, and owners almost never see it: in one 101-cat study, exactly one owner had noticed lameness.
• The early sign of feline arthritis is a changed jump, not a limp: 71% of clinically arthritic cats had a changed ability to jump and 67% jumped lower in the key 28-case study.
• Long-term arthritis NSAIDs are licensed for cats in the UK, Canada and Australia but not in the US; the monthly Solensia antibody injection is approved in all four markets.
• The pooled evidence supports omega-3 for feline joint pain and finds glucosamine-chondroitin measurably ineffective.
• Obese cats were 4.9 times more likely than lean cats to develop lameness needing veterinary care; weight is the one lever owners fully control.
• The five-dollar fixes work: a low-sided litter box, a ramp to the favorite sleeping spot, warm bedding for stiff mornings.