# Swollen Paw or Leg in Cats: Causes and What to Do A swollen paw in cats usually points to a local problem such as an abscess, insect sting, foreign object, or injury, though some cats develop immune-related swelling of the paw pads. Swelling that appears suddenly, affects one limb, or comes with limping, pain, or fever needs a veterinarian. This article is educational and is not a substitute for veterinary diagnosis or treatment. ## Quick Answer - One swollen paw or leg is most often caused by infection, trauma, a foreign body, or an insect sting, while swelling in multiple paws can suggest an immune condition or another body-wide problem. - A cat that will not put weight on the leg, cries when you touch the paw, or has a fever needs to be seen the same day. - Never give human pain relievers such as ibuprofen, naproxen, or acetaminophen to a cat. These can be fatal. - Do not squeeze, poke, or try to drain a swollen area at home. You can spread infection or cause more damage. - Warm compresses and keeping your cat indoors are reasonable steps while you arrange a veterinary visit, but they do not replace treatment. ## What a Swollen Paw or Leg Looks Like Swelling can be subtle. You might notice one paw looks puffier than the others, the toes seem thicker, or the leg looks fuller than the matching limb on the other side. Some cats lick the area constantly, leaving the fur damp or matted. Others hold the leg up, limp, or refuse to jump. Swollen paw pads in cats can look shiny, tight, or spongy. The pads may feel warm, and your cat may pull the foot away when you touch it. Swollen back feet in cats often show up as a cat that walks flat on the hock or drags a foot. Compare all four paws and both legs. A little asymmetry is normal in some cats, especially after a long nap or a lot of activity. True swelling usually feels firmer or puffier than the other side and often comes with pain or limping. ## Causes of Swollen Paws in Cats ### Abscess An abscess is a pocket of pus under the skin, often from a bite or scratch. Cat fight wounds are a common trigger. The area swells, feels hot, and may drain pus or blood. Your cat may run a fever, hide, or stop eating. Abscesses need veterinary care because the infection can spread. ### Foreign Body Thorns, splinters, glass, foxtail grass, and small pieces of plastic can lodge in a paw. The body reacts with swelling and inflammation. A foreign body often causes a single swollen paw with a small wound or draining tract. Your veterinarian may need to probe or image the area to find it. ### Insect Sting or Bite Bee stings, wasp stings, spider bites, and ant bites cause rapid swelling, often within minutes. The paw may be painful and warm. Most stings are mild, but some cats have severe allergic reactions. Watch for facial swelling, vomiting, or trouble breathing. ### Trauma Falls, car accidents, and caught paws cause bruising, fractures, and soft tissue damage. Cats can catch a paw in a drawer handle, which has been reported as a cause of serious tarsometatarsal injuries requiring surgery [1]. Swelling after trauma can be immediate or develop over hours. ### Plasma Cell Pododermatitis This immune-related condition causes the paw pads to swell, soften, and sometimes crack or bleed. It often affects multiple pads, especially the central pads. The cause is not fully understood, and diagnosis usually requires a biopsy. ### Less Common Causes Some swellings come from tumors or unusual growths. A rare intramuscular osteochondroma has been reported in a cat's hind limb muscle, causing progressive lameness and a painful mass [2]. Muscle contracture from fibrosis or a soft tissue sarcoma has also been reported as a cause of lameness in cats [3]. Cancer spread to the toes from a lung tumor, called lung-digit syndrome, can cause shifting lameness in older cats [4]. | Cause | Typical clues | How urgent | |---|---|---| | Abscess | Hot, painful swelling, fever, pus, recent bite | Same day | | Foreign body | One paw, small wound, licking, draining tract | Same day | | Insect sting | Sudden swelling, recent sting, warm paw | Same day if mild, emergency if breathing changes | | Trauma | Known injury, limping, bruising, instability | Emergency if non-weight-bearing or open wound | | Plasma cell pododermatitis | Multiple soft, swollen pads, often no wound | Routine visit | | Tumor or unusual growth | Firm mass, slow onset, older cat, weight loss | Routine to urgent depending on signs | ## Red Flags That Mean Emergency Call an emergency clinic right away if you see any of these: - Your cat cannot put any weight on the leg at all. - The leg or paw is crooked, dangling, or obviously broken. - There is heavy bleeding that does not stop with pressure. - The paw is cold, pale, or blue, which can mean poor blood flow. - Your cat is struggling to breathe, has facial swelling, or is vomiting after a sting. - Your cat is collapsed, unresponsive, or having a seizure. - The swelling is spreading quickly up the leg. - Your cat has a fever, is not eating, or is hiding and crying. If your cat swallowed a human medication or a toxic substance, call the ASPCA Animal Poison Control Center at (888) 426-4435 or the Pet Poison Helpline at (855) 764-7661. These services may charge a fee. ## What You Can Do at Home While Waiting Home care is about comfort and safety, not treatment. Keep your cat indoors and restrict jumping and climbing. A quiet room with soft bedding limits further injury. Apply a warm compress to a swollen area for a few minutes at a time if your cat tolerates it. This can help with mild swelling and may bring an abscess to a head, but it will not cure an infection. Check for obvious foreign objects only if they are loose and easy to see. Do not dig into the paw or pull at anything embedded. You can rinse a dirty paw with plain warm water and pat it dry. Do not give any medication unless your veterinarian prescribed it for this cat. Human pain relievers are toxic to cats. Your veterinarian will calculate the correct dose from your cat's weight and health. If your cat is limping, keep a written note of when it started, which leg is affected, and whether the limping comes and goes. This helps your veterinarian narrow down the cause. For more on limping, see [Cat Limping Paw](/knowledge/veterinary-medicine/symptom-guides/cat-limping-paw). ## What the Veterinarian Will Check and Test Your veterinarian will start with a full physical exam. They will compare all four limbs, check for wounds, feel for heat and pain, and watch your cat walk. They will also check your cat's temperature, heart rate, and breathing. If an abscess or foreign body is likely, your veterinarian may clip the fur, clean the area, and probe gently. They may drain an abscess and flush the wound. Most cats need antibiotics and pain relief after this. X-rays help find fractures, joint injuries, or foreign objects. In one report, radiographs and CT identified a mineralized mass in a cat's hind limb muscle that turned out to be an intramuscular osteochondroma [2]. Ultrasound can also help evaluate soft tissue swelling and muscle changes [3]. Blood work may be needed if your cat is systemically ill. If cancer is suspected, your veterinarian may recommend chest X-rays. Lung-digit syndrome should be considered in older cats with shifting, waxing and waning lameness, and thoracic imaging can help find an underlying lung tumor [4]. If plasma cell pododermatitis is suspected, a biopsy of the paw pad may be needed. This is usually done with local anesthesia or light sedation. ## Prevention and Monitoring Keep your cat indoors or in a secure outdoor enclosure to reduce fights, car accidents, and exposure to stings. Check paws after walks or outdoor time for thorns, cuts, and swelling. Trim your cat's nails regularly and keep the fur between the toes short if it mats. This makes it easier to spot problems early. If your cat has a known condition such as plasma cell pododermatitis, follow your veterinarian's monitoring plan. Some cats need repeat exams or medication adjustments. Watch for changes in gait, appetite, and grooming. A cat that stops jumping or starts hiding may be in pain. Early veterinary visits often mean simpler treatment and faster recovery. If you notice swelling in other parts of the body, such as the belly, read [Why Is My Cat's Belly Swollen?](/knowledge/veterinary-medicine/emergency-care/why-is-my-cats-belly-swollen) and [Cat Swollen Belly Causes](/knowledge/veterinary-medicine/clinical-methods/cat-swollen-belly-causes). For older cats with stiffness, see [Cat Limping: Arthritis or Something Else? How to Tell](/knowledge/veterinary-medicine/senior-and-chronic-care/cat-limping-arthritis-or-something-else). ## Limitations and When to Contact a Veterinarian This article gives general information only. Every cat is different, and a swollen paw or leg can have more than one cause. Only a veterinarian who examines your cat can diagnose the problem and prescribe treatment. Contact your veterinarian the same day if your cat has a swollen paw with limping, pain, fever, or a wound. Go to an emergency clinic now if your cat cannot bear weight, has heavy bleeding, trouble breathing, a cold or pale paw, or is collapsed. Schedule a routine visit if the swelling is mild, your cat is eating and acting normally, and there is no wound or severe pain. Even mild swelling that lasts more than a day or two should be checked. ## Frequently Asked Questions ### Should I soak my cat's swollen paw in Epsom salt? No, do not soak your cat's paw in Epsom salt unless your veterinarian tells you to. Cats can absorb minerals through their skin and may lick the area afterward. Warm water compresses are safer for short-term comfort while you arrange a veterinary visit. ### Can a swollen paw in cats go away on its own? Some mild swelling from a minor sting or bruise can improve on its own within a day or two. However, swelling from an abscess, foreign body, or fracture will not resolve without treatment and can get worse. If the swelling is not clearly improving, see your veterinarian. ### How can I tell if my cat's leg is broken or just swollen? You usually cannot tell without an X-ray. A broken leg often causes severe pain, inability to bear weight, and an unnatural angle or instability. If your cat will not use the leg at all or the limb looks deformed, treat it as an emergency. ### Is a swollen paw in cats contagious to other pets? Most causes of swollen paws, such as trauma, stings, and foreign bodies, are not contagious. Some infections from bite wounds can spread to other animals through saliva, so keep your cat separated from other pets until your veterinarian evaluates the wound. Immune conditions like plasma cell pododermatitis are not contagious. ### What if only the back feet are swollen? Swelling in both back feet can suggest an immune condition, heart problem, or other body-wide issue. It can also happen after surgery on the hind limb, since post-operative paw swelling has been reported in cats after tarsal surgery [1]. Your veterinarian will examine all limbs and may recommend blood work or imaging. ## Related Articles - [Why Is My Cat's Belly Swollen?](/knowledge/veterinary-medicine/emergency-care/why-is-my-cats-belly-swollen) - [Cat Swollen Belly Causes](/knowledge/veterinary-medicine/clinical-methods/cat-swollen-belly-causes) - [Cat Limping Paw](/knowledge/veterinary-medicine/symptom-guides/cat-limping-paw) - [Cat Limping: Arthritis or Something Else? How to Tell](/knowledge/veterinary-medicine/senior-and-chronic-care/cat-limping-arthritis-or-something-else) - [Cat Ear Infection with Swelling: What to Do and When to Worry](/knowledge/veterinary-medicine/skin-allergy-and-ear-care/cat-ear-infection-swelling-worry) - [Cat Skin Rash with Swelling: When to Worry](/knowledge/veterinary-medicine/skin-allergy-and-ear-care/cat-skin-rash-with-swelling) - [Puffy Paw in Cats: Swollen Paw Pads and What They Mean](/knowledge/veterinary-medicine/symptom-guides/puffy-paw-cats) - [Cat Paw Abscess: Causes, Signs, and Treatment](/knowledge/veterinary-medicine/skin-allergy-and-ear-care/cat-paw-abscess-treatment) - [Snake Bite on a Cat's Paw or Leg: Signs and First Aid](/knowledge/veterinary-medicine/emergency-and-first-aid/snake-bite-cat-paw-leg) ## References 1. [Partial tarsal arthrodesis with plate fixation for management of traumatic tarsometatarsal injuries in five cats](https://pubmed.ncbi.nlm.nih.gov/41410358/). The Journal of small animal practice, 2026. 2. [Lameness caused by intramuscular osteochondroma in semimembranosus muscle in a male cat](https://pubmed.ncbi.nlm.nih.gov/42343995/). JFMS open reports, 2026. 3. [Brachialis muscle contracture as a cause of lameness in cats: A study of four cases](https://pubmed.ncbi.nlm.nih.gov/41949443/). Australian veterinary journal, 2026. 4. [Feline lung-digit syndrome: A differential diagnosis for shifting, waxing and waning lameness in a cat](https://pubmed.ncbi.nlm.nih.gov/38952750/). The Canadian veterinary journal = La revue veterinaire canadienne, 2024. ## Further Reading - [Merck Veterinary Manual: Cat Owners](https://www.merckvetmanual.com/cat-owners) - [Cornell Feline Health Center: Health Information](https://www.vet.cornell.edu/departments-centers-and-institutes/cornell-feline-health-center/health-information) - [American Veterinary Medical Association: Pet Care](https://www.avma.org/resources-tools/pet-owners/petcare)