When to see a vet urgently
Seek prompt veterinary attention if you notice any of the following:
- Sudden lameness and reluctance to walk.
- An obviously swollen, tender joint, particularly after a bite or another injury.
- Difficulty moving together with fever, marked lethargy or loss of appetite.
A sudden severe symptom should not be interpreted simply as age-related stiffness. You can find a vet near you.
Overview
In arthritis, the joint capsule and surrounding tissues become inflamed. The joint lining thickens, inflammatory fluid accumulates in the joint cavity and cartilage is damaged. This causes pain, restricted movement and lameness. Arthritis often goes unnoticed in cats because they tend to hide pain and adapt to discomfort.
The nature of the changes varies with the joint disease. In everyday language, arthritis often means osteoarthritis. This is a long-term disease of the whole joint, with changes in the bone beneath the cartilage and other joint tissues as well as the cartilage itself. Osteoarthritis also involves inflammation, but differs from a primarily inflammatory joint disease caused by bacteria or the immune system.
The high prevalence of joint problems in older cats relates mainly to osteoarthritis. Other inflammatory joint diseases are considerably rarer in cats. Polyarthritis means inflammation of several joints; it is different from osteoarthritis following a single old injury.
Causes
The main causes of arthritis in cats include:
- joint injuries, including bruising, dislocations and fractures,
- bacterial or viral infections,
- autoimmune diseases in which the body destroys joint tissue,
- degenerative changes with ageing,
- congenital skeletal abnormalities, such as hip dysplasia.
These causes are not equally common and do not require the same treatment. Age increases the likelihood of osteoarthritis, but ageing alone does not explain every joint change. A young cat can also have joint disease, for example following abnormal joint development or injury.
Bacteria can enter a joint through a penetrating wound, such as a bite, or through the bloodstream. Inflammatory disease affecting several joints is more often infectious than primarily immune-mediated in cats. Infection must therefore be investigated before starting treatment that suppresses immune defences.
Risk factors
- older age,
- excess weight, which increases joint loading,
- chronic inflammatory diseases,
- previous injuries,
- hereditary susceptibility in some breeds.
The importance of risk factors depends on whether the problem is osteoarthritis, joint infection or another form of inflammation. Information about all feline risk factors is limited, and the list alone does not establish the cause of symptoms. Excess weight can worsen the effects of osteoarthritis, but treatment planning also assesses muscle condition, movement and any other diseases.
Symptoms
Watch for the following signs:
- lameness or reluctance to jump,
- stiffness, particularly after resting,
- reduced activity and playfulness,
- pain when joints are touched,
- irritability or aggression when picked up or stroked,
- reduced grooming because pain makes licking difficult.
A cat with osteoarthritis may not limp at all. It may use a chair as an intermediate step to reach a table, choose a lower sleeping place or hesitate before jumping down. The change may look like becoming calmer or older, although pain is responsible. Hiding, a change in the desire for contact or avoiding the litter tray can also be related to difficulty moving.
Pay particular attention to changes from your own cat's previous habits. If easy to do, film ordinary walking and movement your cat chooses to make at home. A useful video shows the whole cat and the complete movement in good light. You do not need to encourage a painful jump to demonstrate the symptom.
Possible complications
Untreated arthritis leads to progressive joint damage, persistent pain and reduced quality of life. At an advanced stage, a cat may lose almost all ability to move.
Complete loss of mobility is not the inevitable outcome of every joint disease. Current treatments cannot reverse the structural changes of osteoarthritis, but can reduce pain and everyday difficulties. A treated cat can retain good mobility and quality of life. The prognosis for infectious arthritis, in contrast, depends on factors including infection severity and how much joint damage has already occurred.
Diagnosis at the vet
Diagnosis includes:
- a clinical examination and gait assessment,
- palpating joints for pain and swelling,
- X-rays to detect changes,
- laboratory tests when needed to rule out infection.
Why do X-rays not establish the diagnosis on their own?
The appointment begins with assessment of movement, posture and behaviour. Unfamiliar surroundings can change how a cat moves and make pain harder to recognise. When examining joint range of motion, the vet watches for signs such as tension, avoidance and changes in vocalisation. Muscles and, when needed, other possible causes of difficulty moving are assessed too.
X-rays show structural joint changes, but the extent of visible changes does not always match pain severity. A joint may be painful without an obvious X-ray finding, or an image may show substantial changes without apparent pain. Home observations, examination and images are therefore interpreted together.
Examining joint fluid
If a primarily inflammatory joint disease is suspected, a needle is used to collect a joint fluid sample. Sampling is performed under sterile conditions and may require general anaesthesia. The vet assesses cells in the fluid and sends a bacterial culture when needed. Several joints may need sampling even if only one seems obviously painful.
A blood sample or X-ray alone does not always confirm joint infection. A single negative culture does not rule out infection in every situation either. Further investigations depend on symptoms, samples and suspected pathogens. Immune-mediated inflammation is diagnosed only after infections and other possible underlying factors have been assessed.
Treatment
- treatment depends on the cause: infectious arthritis requires antibiotics selected according to joint fluid investigation, while immune-mediated disease requires medicines that control immune inflammation;
- for degenerative osteoarthritis, pain relief is prescribed by the vet: NSAIDs licensed for cats, such as meloxicam or robenacoxib, with kidney monitoring, or injections of frunevetmab, an antibody targeting nerve growth factor;
- human medicines, including paracetamol, ibuprofen and acetylsalicylic acid, are toxic to cats;
- weight loss in an overweight cat substantially reduces pain;
- ramps and steps to favourite places, a low-sided litter tray and a soft, warm bed help at home.
Medicine selection and treatment intervals are decided individually. Kidney monitoring is part of the overall assessment, but does not itself make every NSAID suitable for every cat. Tell the vet about other diseases, medicines and supplements. Do not combine painkillers or change dosing yourself. Weight management supports osteoarthritis treatment, but does not replace pain relief or treat a bacterial joint infection.
Treating infectious arthritis
A joint infection may require flushing of the joint cavity as well as antibiotics. In a severe case, dead or damaged tissue is removed surgically. Immune-mediated disease is treated differently, which is why similar-looking lameness should not automatically be treated with an old medicine. The cause of joint disease also determines the need for further investigations and follow-up.
Supporting movement at home
Arrange routes so your cat does not need large jumps to reach food, water, the litter tray or a bed. Non-slip surfaces make movement easier on slippery floors. A ramp or sturdy steps must be easy for your cat to use. Preserve favourite resting and observation places at an accessible height too.
Osteoarthritis treatment often combines medication, environmental changes and suitable activity. Vet-guided rehabilitation may be considered individually. Do not forcibly bend a painful joint at home. A concrete everyday goal can be chosen, such as easier litter tray access or joining in play.
Monitoring weight and treatment response
Plan weight loss with the vet if your cat is overweight. Do not suddenly reduce food to the point of fasting: not eating can predispose a cat to serious fatty liver disease. Weight and body condition are monitored so changes are controlled and the diet remains suitable.
Treatment success is assessed using the same everyday observations as at the start. Record stair use, play, jumping and grooming, for example. The vet may provide a pain questionnaire for this purpose. Being quiet alone does not show freedom from pain. If no benefit is seen or your cat's condition changes, the plan is reassessed; pain should not be accepted as part of old age.
Prevention
Preventing arthritis in cats involves comprehensive care:
- maintaining a healthy weight,
- avoiding injuries and excessive strain,
- complete nutrition with adequate nutrients,
- monitoring and treating chronic diseases,
- regular veterinary checks, particularly in older cats.
Even good care cannot prevent every joint injury or all osteoarthritis. Preventive advice reduces manageable harms, but symptoms require examination when they appear. Noticing changes in ordinary behaviour helps recognise pain before obvious lameness develops.
This text provides general information and does not replace veterinary care. If your cat develops symptoms, contact a vet.
Frequently asked questions
Can a cat have osteoarthritis without limping?
Yes. A cat may jump less, use intermediate steps or rest more without visible lameness. Problems affecting joints on both sides can also make limping harder to notice. A recurrent change in your cat's usual movement should be investigated.
Are osteoarthritis and bacterial arthritis the same disease?
No. Osteoarthritis involves long-term changes in joint tissues, while bacterial arthritis involves infection within a joint. Both can cause pain, but antibiotics treat bacterial infection and are not part of routine osteoarthritis management.
Can a cat with osteoarthritis have a good life?
Many can, when pain is controlled and daily life is adapted to mobility. The structural changes do not disappear, so treatment aims for comfortable movement and preservation of activities important to the cat. Treatment is reviewed as symptoms and function change.
This article is for general information only and is not a guide to treatment. If you notice the first signs of illness, contact your vet.
Paw4care editorial team
Sources
- Joint Disorders in Cats, Merck Veterinary Manual, accessed 2026-11-03.
- Chronic Pain Assessment in Cats, American Animal Hospital Association, accessed 2026-11-03.
- Osteoarthritis (OA) in Cats, North Carolina State University College of Veterinary Medicine, accessed 2026-11-03.
- Degenerative Joint Disease in Cats, Feline Veterinary Medical Association, accessed 2026-11-03.
- Inflammatory joint disease in cats: Diagnostic approach and treatment, Journal of Feline Medicine and Surgery / PubMed Central, accessed 2026-11-03.
- Arthritis in Cats, VCA Animal Hospitals, accessed 2026-11-03.
- Obesity, Cornell University College of Veterinary Medicine, accessed 2026-11-03.