Cats do have tonsils. They actually have several types of tonsillar tissue, including palatine tonsils (the equivalent of what most people mean by “tonsils”) and a pharyngeal tonsil, which is the structure humans call an adenoid. These tissues serve the same basic immune function in cats as they do in people, acting as a first line of defense against pathogens entering through the mouth and nose.
Types of Tonsillar Tissue in Cats
Cats possess at least four distinct types of tonsillar tissue: the lingual tonsil (near the tongue), paired palatine tonsils (one on each side of the throat), paired paraepiglottic tonsils (near the epiglottis), and the pharyngeal tonsil. The pharyngeal tonsil sits in the nasopharyngeal area, which is the same location where adenoids sit in humans. So while vets don’t typically use the word “adenoid,” the equivalent tissue is there.
The palatine tonsils are the most clinically relevant. In cats, they’re long, thin, and oval-shaped, tucked into small pockets called tonsillar fossae on either side of the throat between the soft palate and the base of the tongue. Unlike human tonsils, which are often visible when you open your mouth wide, a cat’s palatine tonsils are normally hidden inside these fossae. You won’t see them unless they’re swollen.
What Tonsils Do for Your Cat
All of this tonsillar tissue is part of a larger immune network called nasopharyngeal-associated lymphoid tissue, or NALT. This network of immune cells lines the oropharyngeal region and is specifically designed to recognize viral, bacterial, and fungal pathogens as they enter through the airways or mouth. When a pathogen lands on these tissues, the immune cells there trigger production of antiviral and antibacterial compounds to fight the infection early, before it spreads deeper into the body.
The feline lymph nodes, spleen, tonsils, and other immune organs are structurally comparable to those in other mammals. Your cat’s tonsils work essentially the same way yours do: they sample whatever comes in through the mouth and nose, identify threats, and help coordinate an immune response.
Signs of Tonsil Problems in Cats
Tonsillitis, or inflammation of the tonsils, does occur in cats, though it’s less commonly diagnosed than in dogs. The most noticeable sign is gagging, often followed by retching or a short, soft cough that may produce small amounts of mucus. In more severe cases, you might notice your cat drooling more than usual, losing interest in food, appearing lethargic, or having obvious difficulty swallowing. Swollen tonsils can range from barely protruding out of their normal pockets to growing large enough to interfere with swallowing or even cause noisy, labored breathing.
These symptoms overlap with many other feline conditions, from upper respiratory infections to dental disease, so they’re not always easy to pin down without a veterinary exam.
How Vets Examine a Cat’s Tonsils
A thorough oral exam in a cat includes inspection of the tonsils, the arches of tissue around them, and the walls of the oropharynx. The vet looks for inflammatory or ulcerative changes in these areas. However, getting a good look isn’t always straightforward. Some cats tolerate a mouth exam while awake if gently restrained by an assistant, but cats that are in pain or simply uncooperative often need to be examined under general anesthesia. Disease in the tonsils and surrounding tissues is frequently easier to spot once a cat is anesthetized and the mouth can be examined in detail.
For deeper evaluation, imaging comes into play. MRI can be used to assess the palatine tonsils, though it’s not routine. In one study using MRI scans, the tonsils weren’t even visible in every cat examined, which speaks to how small and well-hidden they normally are.
Tonsillar Tumors in Cats
Tonsillar tumors are rare in cats, but they do happen. Squamous cell carcinoma is the most common type of oral cancer in cats, and while it usually affects the jaw or oral lining, it can also develop in the tonsils. Most of the published information on tonsillar squamous cell carcinoma comes from dogs, where it’s more frequently reported, and the veterinary literature on the feline version is limited to a small number of case reports.
Interestingly, the prognosis for tonsillar tumors may be somewhat better than for the same cancer in other oral locations. In one retrospective study of 31 cats with oral squamous cell carcinoma, the cats whose tumors involved the tonsils had notably longer survival times than those with tumors of the tongue, jaw, or other sites. The tonsillar group had a mean survival of 724 days, compared to a median of 141 days for cats with tumors elsewhere in the mouth. The numbers are small, so broad conclusions are difficult to draw, but it’s a meaningful difference.
Because tonsillar tumors can initially look like tonsillitis, with swelling and difficulty swallowing, persistent throat symptoms in a cat that aren’t responding to treatment warrant follow-up, particularly in older animals.