Symptoms2026-03-09Carelogy編集部
10 Early Signs of Cancer in Cats: How to Catch It Early
10 early warning signs of cancer in cats. Learn about lymphoma, mammary tumors, and squamous cell carcinoma. Self-check methods for early detection.
The Bottom Line: Early Detection Dramatically Improves Cancer Outcomes
Cats develop cancer just like people do. Cancer accounts for roughly 30% of deaths in cats over age 10. But early detection changes everything — many cancers caught in their initial stages can be cured with surgery, or at least managed to significantly extend your cat's life. The most effective screening tool is something you already have: your own hands. Regularly touching and feeling your cat's body for changes is the simplest and most powerful way to catch problems early.
10 Early Warning Signs of Cancer in Cats
If you notice even one of these signs, a vet visit is warranted:
1. Lumps or swelling: Any palpable mass on or under the skin — especially one that is growing.
2. Unexplained weight loss: If your cat is losing weight despite eating, that is a red flag.
3. Persistent appetite loss: Poor appetite lasting more than a week.
4. Wounds that will not heal: Sores in the mouth or on the skin that linger.
5. Bleeding or foul odor from the mouth: Potential sign of oral squamous cell carcinoma.
6. Changes in urination or defecation: Blood in urine or stool, persistent diarrhea or constipation.
7. Unexplained bleeding or discharge: Nosebleeds or discharge from the genital area.
8. Chronic vomiting or diarrhea: Could indicate gastrointestinal lymphoma.
9. [Lethargy](/en/columns/cat-lethargy) or decreased activity: Noticeably less movement than before.
10. Difficulty breathing or coughing: May suggest a chest tumor or lung metastasis.
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The Most Common Cancers in Cats
Lymphoma: The most common cancer in cats. It comes in several forms — gastrointestinal (chronic vomiting, diarrhea, weight loss), mediastinal (breathing difficulty), and multicentric (swollen lymph nodes). FeLV/FIV-positive cats face elevated risk.
Mammary tumors: Most frequent in unspayed females. About 85% of feline mammary tumors are malignant (compared to roughly 50% in dogs). Early spaying dramatically reduces lifetime risk.
Squamous cell carcinoma (SCC): Develops in the mouth or on the skin of the ears and nose. White cats and those with lightly pigmented ears are at higher risk due to sun exposure.
Fibrosarcoma: Known as feline injection-site sarcoma (FISS), these rare tumors can develop at previous vaccination sites.
How to Do a Monthly Self-Check at Home
Once a month, give your cat a full-body check while they are relaxed and comfortable.
Head and neck: Look inside the mouth (gum color, any lumps), check the inner ears, and feel the lymph nodes under the jaw.
Torso: Feel the armpits, run your hands along the belly checking all 6–8 nipples along the mammary chain, and check the back.
Hind legs and tail: Feel behind the knees for swollen lymph nodes, and check around the anal area.
Key things to note: Asymmetric lumps, any mass that grows over a 2-week period, and lumps that are hard or fixed in place are all cause for a vet visit.
The CatsMe app's health check feature is a handy way to log daily observations and spot gradual changes you might otherwise miss.
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