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Lymphadenopathy in Cats: Understanding Lymph Node Inflammation Symptoms Causes and Treatment

Thomas Aug 04, 2026

Lymphadenopathy (Lymph Node Inflammation) in Cats

Lymphadenopathy in Cats Lymph Node Inflammation
Lymphadenopathy in Cats Lymph Node Inflammation

Lymphadenopathy is a condition that causes the lymph nodes to swell or enlarge. Lymphadenopathy in cats can occur for a variety of reasons and can manifest itself in a variety of locations, including the submandibular, prescapular, popliteal, and mesenteric lymph nodes . This article reviews the causes, symptoms, and treatment of Lymphadenopathy in cats .

Feline Lymphoma
Feline Lymphoma

Lymphadenopathy , or enlarged lymph nodes , can occur for a number of reasons. In cats , the lymph nodes can become enlarged—most commonly, from bacterial infection (s), viral infection (s), intestinal inflammation , and cancer.

Lymphadenopathy in Cats

Veterinarians discover new insights into GI lymphoma in cats Flint
Veterinarians discover new insights into GI lymphoma in cats Flint

What is lymphadenopathy in cats ? Lymphadenopathy is a broad term used to describe enlarged or swollen lymph nodes . The lymph nodes are part of the lymphatic system, a network of tissues and organs that help rid the body of toxins, waste and other unwanted materials. The primary function of the lymphatic system is to transport lymph , a fluid containing infection-fighting white blood cells ...

Reactive hyperplasia or inflammatory lymphadenopathy or lymphadenitis, when the lymph nodes are reacting to a challenge, such as fungal infections, bacterial infections, viral infections (including feline leukemia virus or feline immunodeficiency virus), or immune reactions (like eosinophilic granulomas or non-neoplastic mast cell infiltrations).

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Cancer in Cats Causes Symptoms and Treatments

Lymph Node Enlargement (Lymphadenopathy) in Cats

The term lymphadenopathy simply refers to enlargement of one or more lymph nodes . Read on to learn how this affects cats , the symptoms to watch for and potential causes.

Causes of Lymphadenopathy in Cats Lymphadenopathy can affect cats at any age. It is a reaction in the lymph nodes that can be caused by a virus, inflammatory condition, vaccine reaction, tick-borne illness, cancer, or other infection.

PET TALK Small cell GI lymphoma A hidden cancer behind feline
PET TALK Small cell GI lymphoma A hidden cancer behind feline

Lymph Node Inflammation in Cats (Lymphadenitis) in cats

Definition Lymphadenitis, also known as inflammation of the lymph nodes , is a condition in which a cat's lymph nodes are inflamed. This inflammation can be caused by various factors, including infections, injuries, or systemic diseases.

Enlarged lymph nodes in cats don't always point to neoplasia. Use this extensive list to review the many potential causes of feline lymphadenopathy .

Distribution of lymphoma by anatomical location and age of cats
Distribution of lymphoma by anatomical location and age of cats

Cat Swollen Lymph Nodes

Learn the causes of swollen lymph nodes in cats , symptoms to watch for, and when to call your vet for diagnosis and treatment.

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Inflammatory conditions like miliary dermatitis in cats can also lead to swollen lymph nodes as the body responds to skin irritation. Additionally, conditions affecting the digestive system, such as acid reflux in cats , may trigger immune responses that enlarge these nodes .