Article published year 2022 – Updated 2026

What is lymphosarcoma (lymphoma) in cats? Cat lymphosarcoma is a malignant neoplastic disease of the lymphatic system, consisting of lymph nodes joined by a system of small vessels. In lymphomas, malignant lymphoid cells infiltrate various parts of lymphoid tissues throughout the body. Lymphosarcoma is one of the most common malignancies in cats, and according to some reports, it ranks first among all types of cancer in cats.

Lymphosarcoma, or lymphoma, is a malignant neoplasm that affects the lymphocytes (white blood cells) of the immune system. It is the most diagnosed cancer in cats. It can affect various organs, but the most common form today is food (intestinal) lymphoma. It is crucial to distinguish between:

• Small cell lymphoma (Low Grade): Slow-growing, often manageable as a chronic disease for years.
• Large cell lymphoma (High Grade): Fast-growing, aggressive and with a more reserved prognosis.

Intestinal lymphoma is often confused with IBD (Inflammatory Bowel Disease).

The “Silent” Symptoms of Intestinal and Mediastinal Lymphoma

Often the symptoms are mistaken for “hairballs” or simple gastritis. Pay attention to:

• Chronic vomiting: Not sporadic, but frequent (several times a week).
• Progressive weight loss: The cat eats but loses weight (malabsorption).
• Diarrhea: Or loose, malformed stools.
• Loss of appetite (anorexia): Often in alternating phases.
• Dyspnea (Mediastinal Lymphoma): Breathing with your mouth open or labored if the tumor presses on your lungs.

Cat lymphosarcoma

Lymphomas in cats, depending on the histological classification, are divided into two large groups: B-cell lymphomas and T-cell lymphomas. Depending on the clinical signs, feline lymphomas are divided into:

• mediastinal lymphosarcoma: affects the lymph nodes of the chest cavity
• food-borne lymphosarcoma: affects the gastrointestinal tract
• multicentric: affects the lymph nodes of the spleen and liver
• extranodal : damage to non-lymphoid organs
• Feline lymphocytic leukemia: it starts in the bone marrow
• Renal lymphoma: kidney

Separately, a relatively new type is distinguished: MALT lymphoma is an extranodal lymphoma of the cells of the marginal zone, which mainly affects the stomach and presents considerable difficulties in early diagnosis.

The etiology of lymphomas in cats is complex. First, the causes of lymphosarcoma are associated with the transport of feline leukemia virus (FeLV)

The causes of occurrence are most often viral in nature. Young cats with lymphosarcoma tend to be FeLV-positive, which means they have the feline leukemia virus, while others are usually FeLV-negative. The immunodeficiency virus (FIV) also increases the risk of developing lymphosarcoma by up to six times.

Diagnosis of lymphosarcoma in cats

In blood counts, the following are observed:

• anemia
• a severe decrease in the number of lymphocytes (lymphocytopenia) and the appearance of immature forms of lymphocytes (lymphoblastosis).

To establish the location of the tumor, a biochemical blood test is carried out, in particular on:

• bilirubin;
• liver enzymes;
• protein, creatinine;
• electrolytes.

Treatment of lymphosarcoma in cats

Lymphosarcoma in cats is usually treated with chemotherapy. In almost all cases, the cat is given a combination of different medications for several weeks. In general, cats tolerate chemotherapy very well. In the event of complications, treatment is adapted to reduce side effects.

Prospects for the treatment of lymphosarcoma in cats.

The chance of cure and survival of cats with lymphosarcoma varies depending on the presence of FeLV, the location of the tumor, and how quickly the tumor was diagnosed. If a cat was diagnosed with lymphosarcoma at an early stage and had a positive response to chemotherapy, such an animal can live from 3 months to 3 years. In the later stages, the prognosis of the disease is poor, and only symptomatic therapy can be performed, which can improve the animal’s condition and alleviate its suffering.

Integrated Therapies: Beyond Cortisone

Traditional therapy is often based on chemotherapy (e.g. CHOP protocol or Chlorambucil for low grades) and cortisone (Prednisone). The holistic approach serves to support the body debilitated by drugs and disease.

1. Microbiota support: Because intestinal lymphoma destroys absorption, the use of specific probiotics and digestive enzymes is vital.
2. Mycotherapy: Coriolus Versicolor mushroom and Maitake are studied for immune support in oncology.
3. Vitamin B12: Almost all cats with intestinal lymphoma are deficient in B12 (Cobalamin), which is essential for energy and appetite. It must almost always be supplemented (often via injection).

Cat lymphoma natural support remedies

There are several natural remedies that can support the cat during the disease, to slow down neoplastic cachexia, counteract the side effects of chemotherapy.

Discover 30 Natural Remedies for Cancer in Cats

Frequently Asked Questions about Feline Lymphoma

How long does a cat live with lymphosarcoma?

The prognosis varies enormously. In small cell lymphoma (Low Grade), with the right care, cats can live well for 2-4 years or more. In large cell lymphoma (High Grade), survival without therapy is a few weeks; With chemotherapy it can be up to 6-9 months, although some cats respond very well by exceeding a year.

Does the cat suffer from lymphoma?

In the early stages, no, but intestinal lymphoma causes nausea and malaise. Pain and nausea management (with medications such as Maropitant or natural remedies such as veterinary ginger/CBD) is prioritized to ensure a good quality of life.

Lymphoma or IBD (inflammation)? How to distinguish them?

The symptoms are identical. Ultrasound can give a suspicion (thickening of the intestinal walls), but the only 100% certain diagnosis is with biopsy (or specific cytological tests). Often you start treating as IBD and monitor the response.