Household Plants, Foods, and Products That Are Toxic to Cats

Plants in the Lilium and Hemerocallis genera — including Easter lilies, tiger lilies, Asiatic lilies, and daylilies — are among the most acutely dangerous plants a cat can encounter. Even small exposures, such as chewing a single leaf or drinking water from a vase containing cut lilies, can cause acute kidney failure in cats. Symptoms typically begin within hours and include vomiting, lethargy, and loss of appetite, progressing to kidney shutdown without prompt treatment. Peace lilies and calla lilies belong to different plant families and cause different (primarily oral irritation) effects, but are still considered toxic.

The sago palm (Cycas revoluta) is a popular decorative plant, but every part of it — seeds, leaves, and roots — contains cycasin, a toxin that causes severe liver damage and can be fatal. The seeds (also called nuts) carry the highest concentration. Sago palm poisoning is considered a veterinary emergency, with symptoms that can include vomiting, diarrhea, jaundice, and neurological signs. Because of its widespread availability as a landscaping and indoor ornamental plant, it remains a frequent source of serious toxicity cases in cats and dogs alike.

Pothos (Epipremnum aureum), philodendrons, dieffenbachia, and many related houseplants contain insoluble calcium oxalate crystals. When a cat chews these plants, the crystals penetrate soft tissue in the mouth and gastrointestinal tract, causing intense burning, drooling, pawing at the mouth, swelling, and difficulty swallowing. While these plants are generally less likely to cause organ failure than lilies, the oral pain and swelling can be severe enough to interfere with breathing in significant exposures. Their popularity as easy-care indoor plants makes them a common hazard.

All members of the allium family — onions, garlic, leeks, chives, and shallots — are toxic to cats whether raw, cooked, powdered, or dehydrated. These plants contain compounds called organosulfoxides that damage red blood cells, leading to a condition called hemolytic anemia. Garlic is considered more potent than onion on a per-weight basis. Because garlic and onion powders are concentrated, even small amounts of seasoning — such as those found in baby food or broths — can be harmful. Cats may not show signs immediately; symptoms like weakness, pale gums, rapid breathing, and collapse can develop days after repeated or large exposures.

Grapes and raisins are well-established as toxic to dogs, but the evidence also warrants caution with cats. The exact mechanism causing kidney damage is not yet fully understood, and sensitivity varies — but because no safe threshold has been established, veterinary consensus treats any exposure as potentially serious. Raisins, which are dried and concentrated, are considered higher-risk than fresh grapes. Given that the toxic dose and mechanism remain unclear, even small amounts should prompt contact with a veterinarian. Grapes and raisins frequently appear in snacks, baked goods, and trail mixes accessible to curious cats.

Xylitol is a sugar alcohol used as a sweetener in a wide range of products: sugar-free gum, certain peanut butters, mouthwash, vitamins, and some baked goods. In dogs, xylitol is well-documented to cause dangerous drops in blood sugar and liver damage. Evidence specific to cats is less extensive, but veterinary guidance generally recommends treating xylitol as a hazard for cats as well, given the physiological similarities in how the compound is metabolized and the potential severity of effects. Always check ingredient labels on human foods before allowing any cat access.

Acetaminophen (the active ingredient in Tylenol and many combination cold and pain products) is highly toxic to cats at doses that would be considered low or safe for humans. Cats lack the liver enzyme needed to safely metabolize it, leading to damage of red blood cells and liver tissue. Even a single regular-strength tablet can be lethal to a cat. Ibuprofen and naproxen — common over-the-counter NSAIDs — can also cause gastrointestinal ulcers and kidney failure in cats. Never give a cat any human pain reliever without direct veterinary instruction. This is one of the most preventable causes of accidental cat poisoning in US households.

Bleach, disinfectant sprays, drain cleaners, toilet bowl cleaners, and phenol-based products (often found in pine-scented cleaners) can all cause harm to cats through direct contact, ingestion from grooming contaminated paws, or inhalation of fumes. Phenols are of particular concern because cats are especially sensitive to them and cannot effectively metabolize phenolic compounds. Symptoms can include drooling, vomiting, difficulty walking, respiratory distress, and chemical burns to the mouth or skin. After using cleaning products, ensure surfaces dry completely and are well-ventilated before allowing cat access, and store all products in secured cabinets.

The popularity of essential oil diffusers and aromatherapy products has introduced a newer category of household risk for cats. Many essential oils — including tea tree (melaleuca), eucalyptus, peppermint, clove, and citrus oils — are toxic to cats, even at relatively low concentrations. Cats can be exposed through skin contact (from topical application or walking across surfaces where oil has dropped), ingestion during grooming, or prolonged inhalation from active diffusers. Symptoms of essential oil toxicity can include drooling, tremors, difficulty walking, respiratory distress, and liver damage. Passive diffusers, direct application, and sprays carry the greatest risk.