What is lymphoma in cats and how common is it?
Lymphoma is one of the most frequently diagnosed cancers in cats. It is a malignant tumour of lymphocytes — white blood cells that form part of the immune system — and can develop in the lymph nodes, gastrointestinal tract, chest, kidneys, or nasal passages. MaxPetz in Delhi provides dedicated cancer care for cats, including evaluation and management of feline lymphoma.
Because lymphoma can affect multiple organ systems, early recognition of signs is critical to improving a cat's quality of life and treatment response.
Tip: Feline lymphoma is not a single disease — its behaviour, prognosis, and treatment differ significantly depending on the type and location. A thorough veterinary assessment is the essential first step.
What are the first signs of lymphoma in cats?
Early signs of feline lymphoma are often subtle and can resemble those of other common illnesses, which is why it is frequently mistaken for inflammatory bowel disease, respiratory infections, or kidney disease. The signs vary depending on which part of the body is affected.
General signs across all types:
- Unexplained weight loss
- Reduced appetite or complete loss of interest in food
- Lethargy and reduced activity
- Vomiting or regurgitation
- Diarrhoea or changes in stool consistency
- Visibly enlarged lymph nodes (felt as lumps under the jaw, behind the knees, or in the groin)
Signs specific to location:
| Location | Common Signs |
|---|---|
| Gastrointestinal | Chronic vomiting, diarrhoea, weight loss, poor coat condition |
| Mediastinal (chest) | Laboured breathing, open-mouth breathing, muffled heart sounds |
| Nasal | Chronic nasal discharge, sneezing, facial swelling |
| Renal | Increased thirst, increased urination, vomiting |
How is feline lymphoma diagnosed and staged?
Accurate diagnosis and staging guide treatment decisions and help owners understand what to expect. A veterinarian will typically recommend a combination of the following:
- Physical examination — palpation of lymph nodes and abdomen to detect masses or organ enlargement.
- Blood and urine tests — complete blood count, biochemistry panel, and urinalysis to assess organ function and detect abnormalities.
- Imaging — abdominal ultrasound and chest X-rays to identify tumour location and extent of spread.
- Fine needle aspirate or biopsy — a sample of cells or tissue from an affected lymph node or organ, examined under a microscope to confirm lymphoma and determine cell type.
- Immunohistochemistry or PCR — additional laboratory tests to classify the lymphoma as B-cell or T-cell origin, which influences prognosis.
Staging describes how widely the cancer has spread. Veterinary oncologists use a modified World Health Organization (WHO) staging system for cats, ranging from Stage I (single lymph node or organ involved) to Stage V (bone marrow or blood involvement).
What is the difference between low-grade and high-grade lymphoma in cats?
The grade of lymphoma — determined by the size and behaviour of the cancer cells — is one of the most important factors in predicting how a cat will respond to treatment.
| Feature | Low-Grade (Small Cell) | High-Grade (Large Cell) |
|---|---|---|
| Cell size | Small lymphocytes | Large lymphocytes |
| Progression | Slow-growing | Aggressive, fast-growing |
| Common location | Gastrointestinal tract | GI tract, mediastinum, multicentric |
| Treatment | Oral chemotherapy (chlorambucil + prednisolone) | Multi-drug IV chemotherapy protocols |
| Remission potential | High; many cats respond well for extended periods | Variable; remission achievable but shorter duration |
Low-grade gastrointestinal lymphoma is the most common form seen in older cats and is frequently confused with inflammatory bowel disease, as both conditions share similar clinical signs and require biopsy for definitive differentiation.
How is lymphoma in cats treated?
Treatment depends on the grade, location, and stage of lymphoma, as well as the cat's overall health. The goal of treatment is to achieve remission — a state in which signs of cancer are no longer detectable — and to maintain quality of life for as long as possible.
Main treatment options include:
- Oral chemotherapy — for low-grade lymphoma, a combination of chlorambucil (an oral alkylating agent) and prednisolone (a corticosteroid) is a commonly used protocol. Many cats tolerate this well with minimal side effects.
- Multi-drug chemotherapy protocols — for high-grade lymphoma, combinations such as COP (cyclophosphamide, vincristine, prednisolone) or CHOP-based protocols may be recommended. These are typically administered by a veterinary professional.
- Corticosteroids alone — in cats where chemotherapy is not an option, prednisolone alone can help manage signs and improve comfort, though it does not achieve remission.
- Supportive care — nutritional support, anti-nausea medication, appetite stimulants, and fluid therapy to maintain the cat's strength and wellbeing during treatment.
- Surgery or radiation — occasionally used for localised forms such as nasal lymphoma, where radiation therapy can be effective.
Warning: Never administer human chemotherapy drugs or corticosteroids to your cat without direct veterinary supervision. Dosing, scheduling, and monitoring must be managed by a qualified veterinary professional to avoid serious harm.
Cats generally tolerate chemotherapy better than humans, with most experiencing only mild side effects such as temporary appetite changes or mild lethargy. Severe reactions are less common but require prompt veterinary attention.
When should you bring your cat to a vet for lymphoma concerns?
Do not wait for signs to become severe. Seek veterinary assessment promptly if your cat shows any of the following:
- Weight loss of more than 10% of body weight over 4–6 weeks without a dietary change
- Vomiting or diarrhoea persisting for more than 5–7 days
- Visible lumps or swellings under the skin or along the jaw, neck, or limbs
- Laboured or open-mouth breathing at rest
- Complete refusal to eat for more than 48 hours
- Sudden, marked lethargy or collapse
- Chronic nasal discharge or sneezing lasting more than 2 weeks
Early-stage lymphoma — particularly low-grade gastrointestinal lymphoma — often responds well to treatment when identified before significant organ damage has occurred. Delaying assessment reduces the window for effective intervention.
If your cat has already been diagnosed with inflammatory bowel disease and is not responding to standard treatment, ask your veterinarian whether a biopsy to rule out lymphoma is appropriate, as the two conditions can be difficult to distinguish on clinical signs alone.
How does MaxPetz Delhi support cats with lymphoma?
MaxPetz in Delhi offers cancer care for cats with a focus on accurate diagnosis, individualised treatment planning, and compassionate support for both pets and their owners. The clinic uses cutting-edge veterinary technology to evaluate feline patients and guide appropriate management of conditions including feline lymphoma and other cancers.
The care approach at MaxPetz Delhi includes:
- Thorough clinical examination and diagnostic workup tailored to each patient
- Access to chemotherapy protocols appropriate for feline patients
- Ongoing monitoring and supportive care throughout treatment
- Clear, honest communication with owners about prognosis and quality-of-life considerations
- Guidance on palliative and end-of-life care when curative treatment is not the right path
Book a consultation at MaxPetz Delhi
If you have concerns about your cat's health or have noticed any of the signs described on this page, use the booking form on this page to arrange an assessment with our veterinary team.