---
title: "Why Is My Cat Drooling Excessively?"
description: "Sudden heavy drooling in cats may mean nausea, mouth pain, or toxin exposure. Lilies, permethrin, and human medications are common UK cat toxins."
url: "https://pethealth.org.uk/health/cat-drooling-excessively"
canonical: "https://pethealth.org.uk/health/cat-drooling-excessively"
date_published: "2026-06-25"
date_modified: "2026-06-25"
source: "PETHEALTH+"
---

# Why Is My Cat Drooling Excessively?

**Light drooling when kneading is often normal.** Sudden heavy drooling — especially with pawing at the mouth, hiding, or vomiting — may mean **nausea, dental pain, or toxin exposure**. Lilies, permethrin in dog flea products, and human medicines are common UK cat toxins. Known toxin contact is an emergency.

## Normal drooling vs hypersalivation

Some cats drool a little when **content** — kneading a blanket or purring on your lap. This is usually a thin strand of saliva, not soaking fur or pooling on the floor.

**Sudden hypersalivation** — thick strings of drool, wet chin and chest, often with **distress** — needs investigation.

**Usually harmless:**

- Light drooling during **kneading or purring**
- Brief drool before vomiting a **single hairball** — see [Cat hairballs](/health/cat-hairballs)

**Needs investigation:**

- **Sudden heavy drooling** without obvious cause
- **Pawing at the mouth** or refusing to eat
- Drooling with [vomiting](/health/why-is-my-cat-vomiting), [hiding](/health/why-is-my-cat-hiding), or [not eating](/health/cat-not-eating)
- **Foul breath** or visible oral swelling
- Drooling after **plant, chemical, or medication** contact

## Common causes in UK cats

| Cause | Typical signs | Notes |
|-------|---------------|-------|
| **Nausea** | Drooling before vomiting, lip smacking | Motion sickness, kidney disease |
| **Dental disease** | Bad breath, pawing mouth, reluctance to eat | See [Cat dental care UK](/health/cat-dental-care-uk) |
| **Oral ulcers or foreign body** | Sudden drooling, difficulty eating | String or bone fragments — urgent check |
| **Lily poisoning** | Drooling, vomiting, lethargy | Emergency — see [Lily poisoning](/health/lily-poisoning-in-cats) |
| **Permethrin toxicity** | Tremors, drooling, seizures | From dog flea products on cats |
| **Human medications** | Sudden illness after access to tablets | Never medicate without vet advice |
| **Heat or stress** | Panting and drooling | See [Cat hot weather safety](/health/cat-hot-weather-safety-uk) |

### Toxin exposure

Cats are sensitive to many substances that seem harmless. **Lilies** — all parts are toxic. **Permethrin** in some dog flea treatments causes severe reactions in cats. **Essential oils**, **cleaning products**, and **human painkillers** are also dangerous. If exposure is possible, phone your vet immediately.

## When to see a vet urgently

Phone your vet **immediately** or use **emergency out-of-hours care** if:

- **Known or suspected lily**, permethrin, or medication ingestion
- **Difficulty breathing**, open-mouth breathing, or collapse
- **Seizures or tremors** with drooling
- **Extreme lethargy** or unable to stand
- **Severe vomiting** with blood or repeated retching
- Drooling after **string, ribbon, or bone** ingestion

Book a **same-day appointment** for sudden heavy drooling without obvious toxin access — mouth pain and nausea need prompt assessment.

## Home care before your appointment

While waiting for a vet visit, note:

- **When** drooling started and how much
- **Possible toxins** — plants, cleaning products, medications, flea treatments
- **Appetite and vomiting** — see [Why is my cat vomiting?](/health/why-is-my-cat-vomiting)
- **Behaviour** — hiding, vocalising, or aggression when mouth touched

**What you can do at home:**

- Keep your cat **calm and confined** safely if disoriented
- Do **not** force food or water if vomiting
- Bring the **product label or plant** if toxin exposure is suspected
- Gently wipe drool with a **damp cloth** — do not inspect the mouth if your cat is painful

**What not to do:**

- Do not give **human anti-nausea or pain medicines**
- Do not induce vomiting unless **your vet instructs you**
- Do not delay if **lily or permethrin** exposure is possible

## What your vet may do

Examination may include checking the mouth, teeth, tongue, and throat under sedation if needed. Your vet might recommend:

- **Blood tests** for kidney disease or metabolic illness
- **Dental treatment** or extraction for painful teeth
- **Toxin-specific care** — activated charcoal, fluids, or hospitalisation
- **Anti-nausea medication** for motion sickness or illness

Treatment depends on cause — dental disease needs oral care; toxins need urgent supportive treatment. Early action improves outcomes for lily and permethrin cases.

## Related guides

- [Lily poisoning in cats](/health/lily-poisoning-in-cats)
- [Why is my cat vomiting?](/health/why-is-my-cat-vomiting)
- [Cat not eating](/health/cat-not-eating)
- [Cat dental care UK](/health/cat-dental-care-uk)
- [Can I give my cat paracetamol?](/health/can-i-give-my-cat-paracetamol)

## FAQs

### Do happy cats drool?

Some cats drool lightly when kneading or relaxed — this is behavioural and distinct from sudden heavy hypersalivation with distress, hiding, or vomiting.

### Can dental disease cause drooling in cats?

Yes — painful teeth, gum disease, and oral ulcers cause drooling, pawing at the mouth, and reluctance to eat. See your vet for a mouth examination.

### Is drooling an emergency in cats?

Sudden heavy drooling with known toxin exposure, difficulty breathing, collapse, or extreme lethargy is an emergency. Phone your vet or emergency clinic immediately.

### Why does my cat drool in the car?

Motion sickness is common. Some cats also hyperventilate from stress. Ask your vet about safe anti-nausea options before long journeys.

## Sources

- [PDSA — Cat health advice](https://www.pdsa.org.uk/pet-help-and-advice/pet-health-hub)
- [Blue Cross — Cat advice](https://www.bluecross.org.uk/pet-advice)
- [Cats Protection — Health advice](https://www.cats.org.uk/help-and-advice)

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Last modified: 2026-06-25