More precisely, radiculitis means inflammation of a nerve root, while radiculopathy is a general term for impaired nerve root function. Mechanical compression alone does not prove inflammation. The cause of symptoms and the location of the damage determine which investigations and treatment your cat needs.
When to see a vet urgently
Seek immediate care if your cat has any of the following:
- A sudden inability to walk or rapidly worsening limb weakness.
- Back pain with difficulty urinating or loss of bladder control.
- Severe pain, a fall or a road traffic accident.
- Weakness with breathing difficulty or altered consciousness.
Keep an injured cat's movement to a minimum during transport. Do not wait for a specialist appointment to become available if its condition is deteriorating. You can find a vet near you.
Overview
Spinal nerve roots are the parts of nerves that leave the spinal cord through openings between the vertebrae. When a root becomes inflamed or compressed, nerve impulse transmission is disrupted, causing pain and problems with sensation and movement. In cats, radiculitis is usually a complication of another spinal or neurological disease rather than a disease in its own right.
The spinal cord and nerve roots are different structures. Motor signals leaving the spinal cord and sensory signals arriving there pass through the roots. The effect of damage depends on which root or other part of the nervous system is involved. Lameness in one limb may reflect nerve pain, whereas more extensive damage may impair several limbs.
However, not every nerve root disease is explained by a structural spinal abnormality. In rare polyradiculoneuritis, inflammation can affect several roots and peripheral nerves. This differs from local compression caused by a single disc. The term radiculitis alone therefore does not indicate whether a cat needs surgery, medication or supportive care.
Causes
- Spinal injuries, including falls and road traffic accidents.
- Herniated or bulging discs.
- Tumours of the spinal cord and bones.
- Osteoarthritis and vertebral bone spurs (spondylosis).
- Viral, bacterial or fungal infections.
- Metabolic disorders, such as metabolic bone diseases.
Assessment considers how quickly symptoms began and progressed. An injury may cause a sudden change, whereas some tumours or inflammatory diseases develop gradually. The same symptom, such as dragging a hind leg, can arise through different mechanisms. Back pain is therefore not automatically attributed to a previously imaged age-related change.
The bone spurs of spondylosis cause no symptoms in many cats. They may sometimes affect a nerve root, but a bony bridge on an X-ray does not itself show that the root is compressed. The location of the finding must fit the clinical signs. More detailed imaging or a sample is sometimes needed to identify another cause.
Risk factors
- Older cats, because of age-related spinal changes.
- Overweight cats, because of greater strain on the spine.
- Cats that have sustained injuries.
- Breeds predisposed to spinal abnormalities, less commonly than in dogs.
Evidence about general risks for nerve root problems in cats is limited. Age, excess weight or breed from this list is not used alone to make a diagnosis. For example, no particular cat breed has been identified as explaining all cases of spondylosis. A young cat can also have an injury or inflammatory neurological disease.
Typical symptoms
- Pain when the back is touched or the cat moves.
- A stiff gait and reluctance to jump.
- Lameness or dragging a limb.
- Reduced activity and apathy.
- Behaviour changes, such as aggression when the back is touched.
- In severe disease, partial or complete hind leg paralysis.
- Urinary and bowel disturbances when the lumbosacral region is damaged.
At home, pain may appear as avoidance of touch or difficulty using a familiar route. Lameness may originate in a joint, muscle, bone or nerve, so both the musculoskeletal system and neurological function are assessed. A cat may spare a limb because of pain or because it cannot support its weight normally.
Record whether one or several limbs are affected and when the change began. A short video of walking at home may help if recording does not delay treatment. Do not encourage jumping to demonstrate symptoms or repeatedly press a painful back. Report urination, bowel movements and any tail injury too.
Complications and consequences
- Chronic pain.
- Progressive neurological problems.
- Wasting of limb muscles.
- Loss of mobility.
- Impaired pelvic organ function.
- Reduced quality of life.
Muscles may shrink because their nerve supply is impaired or because pain reduces use of the limb. The cause of wasting is therefore investigated as part of the overall assessment. Walking ability and bladder function may recover at different rates. Reduced pain alone does not prove that all neurological functions have returned.
Diagnosis at the vet
- Neurological examination to assess sensation and reflexes.
- Spinal X-rays to rule out injuries and osteoarthritis.
- MRI or CT, the gold standard for investigating nerve root damage.
- Myelography if a herniated disc is suspected.
- Blood tests to rule out infectious and metabolic diseases.
The neurological examination assesses limb strength, postural reactions, muscle condition and reflexes. The lesion is localised before more specific tests are chosen. Pulling a paw away from a stimulus is a reflex and does not, on its own, demonstrate conscious perception of pain. Do not test sensation at home by pinching or squeezing the toes.
X-rays mainly show bony structures, but a normal image does not rule out a nerve root or disc problem. MRI is suited to assessing soft tissues and nerve roots. CT and myelography have their own indications; they are not equivalent investigations in every situation. The method is chosen according to the suspected lesion.
An enlarged or contrast-enhancing nerve root on imaging does not always mean a tumour. Swelling associated with compression can also cause changes. If inflammation cannot be distinguished from a tumour, a tissue sample may be considered. A single image therefore cannot directly establish the final prognosis.
Blood tests help investigate systemic illnesses and treatment safety, but do not rule out every neurological disease. Cerebrospinal fluid or the electrical activity of nerves and muscles may be examined when needed. Nerve conduction studies can show how signals travel and help distinguish the nature of the damage.
Treatment
Pain is relieved with medicines selected for the cat. Treatment may combine medicines with different actions, environmental changes and, later, guided rehabilitation. The cause of pain and your cat's other illnesses affect the choice. Do not give human painkillers or medicines from a previous pet without a prescription.
For mild, stable compression, restricted movement and medication may sometimes be chosen. Significant compression or deteriorating neurological function may require surgery. The aim is to release neural structures or treat the change causing the damage. Asymptomatic spondylosis alone is not an indication for surgery.
Treatment for infection targets a confirmed or reasonably suspected organism. Anti-inflammatory corticosteroids are not automatically suitable for every nerve root problem. For example, supportive care is central in acute idiopathic polyradiculoneuritis, and corticosteroids have not shown benefit as they have in some other inflammatory neurological diseases. Medication is chosen according to the diagnosis.
Home care and rehabilitation
Follow the activity instructions given for this particular lesion. Unrestricted jumping during an acute disc problem may worsen the situation even if medication makes your cat seem brighter. Do not start massage, back stretches or forceful manipulation before the stability of the lesion and the safety of rehabilitation have been assessed.
Provide non-slip surfaces, a comfortable resting area and easily accessible water, food and litter trays. A low-sided tray reduces the need to climb. If your cat needs rest, arrange the home accordingly: even ramps must not be used to encourage activity against the prescribed restrictions.
Monitor walking, rest, appetite, urination and bowel movements. An immobile cat needs attention to cleanliness and a dry, soft surface. Contact the practice if your cat cannot urinate; do not attempt to express the bladder manually without an examination and individual teaching. Check-ups assess function and adjust rehabilitation according to the findings.
Agree concrete goals when monitoring chronic pain, such as comfortable litter tray use and peaceful rest. New weakness needs examination even if a previous back problem has been stable for a long time.
Prognosis
The prognosis depends on the cause, extent of damage and remaining nerve function. Some compression problems recover well, but urinary difficulties may persist even when walking improves. Inflammatory disease can also recur. No general recovery time can be promised from the term radiculitis alone, and early treatment does not guarantee reversal of every injury.
Prevention
- Control your cat's weight to reduce strain on the spine.
- Prevent injuries with a safe home, particularly for an older cat.
- Treat infections and inflammation promptly.
- Take older cats for regular veterinary examinations.
- Monitor and treat chronic musculoskeletal diseases.
Weight management and safe places to move support function, but do not prevent every tumour, inflammatory nerve disease or disc change.
Important for cat owners
Radiculitis in cats is always a sign of a more serious spinal or neurological disease. Remember that if your cat has stopped jumping, is lame or reacts painfully when its back is touched, it needs examination by a vet with neurological expertise. Early diagnosis helps prevent serious neurological complications and preserve mobility.
Reduced jumping has other causes too and does not, by itself, mean serious nerve root disease. Start with your usual vet, who can refer for further neurological investigations when needed. Sudden paralysis, severe pain or an inability to urinate nevertheless needs emergency assessment.
This article provides general information and does not replace veterinary care. Contact a vet if you notice signs of illness in your cat.
Frequently asked questions
Does a spinal bone spur always mean nerve compression?
No. Spondylosis is often an incidental finding without symptoms. Its significance is assessed from the location of pain, the neurological examination and more detailed imaging when needed.
Can a nerve root problem look like ordinary lameness?
Yes. Nerve pain or poor limb support can change the gait. Examination distinguishes neurological causes from joint, bone and muscle problems.
Is surgery always needed?
No. Treatment depends on the cause, degree of compression and progression of symptoms. Inflammatory neurological disease, mild stable compression and rapidly worsening mechanical damage may require different plans.
Can I assess pain sensation by pinching a paw?
Do not do this. Withdrawal of a limb may be only a reflex. The vet assesses conscious sensation as part of the neurological examination, and a home test cannot replace it.
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
- Imaging and histopathologic features of reversible nerve root and peripheral nerve oedema secondary to disc herniation in a cat, Journal of Veterinary Internal Medicine, accessed 2026-11-04.
- Neurological lameness in the cat: Common causes and clinical approach, Journal of Feline Medicine and Surgery, accessed 2026-11-04.
- Inflammatory Disorders of the Peripheral Nerves and Neuromuscular Junction in Animals, Merck Veterinary Manual, accessed 2026-11-04.
- Spondylosis Deformans in Cats, VCA Animal Hospitals, accessed 2026-11-04.
- Acute vs. Chronic Pain, AAHA, accessed 2026-11-04.
- Disorders of the Spinal Column and Cord in Cats, Merck Veterinary Manual, accessed 2026-11-04.
- First Aid for Cats, VCA Animal Hospitals, accessed 2026-11-04.
- The Neurologic Examination of Animals, Merck Veterinary Manual, accessed 2026-11-04.