The repeating lick is the signal
Licking or smacking the lips sits on the official list of nausea signs in cats, right next to drooling, retching without throwing up, eating less, hiding, lethargy and licking odd things like floors (PetMD).
That is the version worth your attention — not a single lick after grooming, but licking that keeps returning. And because cats hide illness well, subtle changes are exactly the evidence you get (PetMD). The useful move is to stop guessing and start pairing: does the licking come with anything else on that list?
Why nausea tops the list
Nausea in cats is a vague sign with a long cause list — anywhere from a food switched too fast, to hairballs, constipation, or inflammatory bowel disease, to liver, kidney or thyroid disease, toxins, certain medications, motion sickness, pyometra or brain tumors (PetMD).
The reason vets treat the pairing seriously is the follow-through: a hairball is nothing, but the same licking-plus-drooling pattern can also be pancreatitis or a toxin. The cause list is too long to reason your way through at home, which is why the 24-hour rule exists.
- Short, mild, coming and going, still eating and alert — book a regular appointment; she should be seen within 48 hours (PetMD).
- Signs not resolving within 24 hours, vomiting starting, or no food for 24 hours or more — to the veterinarian as soon as possible, or the emergency hospital if your regular vet is closed (PetMD).
The mouth-pain version
Mouth problems produce the same lip-licking by a different route (Merck):
- Dental pain and stomatitis. Bad breath, drooling that may be blood-tinged, pawing at the mouth, resistance to being examined, enlarged lymph nodes.
- The approach-avoidance reaction. She walks to the bowl in hunger, then hisses and runs off — anticipating the discomfort of eating. That is a mouth finding, not fussiness.
- Ptyalism. Excessive drooling has only two mechanisms: too much saliva being made, or saliva she cannot swallow. Either way it comes out, and the vet will want to rule out the serious causes, including rabies in an unvaccinated cat.
- Something under the tongue. Thread or string can lodge there. Drooling and reluctance to eat are the clues, and the cause can go undiscovered unless the mouth is carefully examined — removal is a veterinary job, not a home one.
If mouth pain is the story, the pattern usually includes dropping food, chewing on one side, or turning the head while eating — bring those observations to the oral exam.
What to do tonight
You are gathering information, not treating — there are no recommended home remedies for a nauseous cat (PetMD):
- Check the pairings: is she eating? Any retching without anything coming up? Drooling? Hiding? Unusually vocal? Licking floors? (PetMD)
- Check the mouth from the outside only. Pawing, bad smell, blood-tinged saliva, or an approach-avoidance reaction at the bowl point at the mouth (Merck).
- Think back 48 hours: new food or treats switched too fast, human food, a missed parasite dose, new medication, access to plants or chemicals, or toys that may have lost a piece.
- Apply the clock: mild and under 24 hours with normal eating and alertness — appointment within 48 hours. Approaching or past 24 hours, vomiting, or no food — call now (PetMD).
If the drool is the louder symptom, start with why is my cat drooling; if she has started vomiting, why is my cat vomiting sets the thresholds.
Frequently asked questions
Is lip licking a sign of nausea in cats?
Yes — licking or smacking the lips is on the standard list of nausea signs, along with drooling, retching without throwing up, eating less, hiding and lethargy (PetMD).
Why does my cat lick her lips and swallow repeatedly?
Two mechanisms overlap: lip licking and swallowing show up with nausea signs (PetMD), and ptyalism — excessive saliva that the cat cannot effectively swallow — makes a cat drool and swallow more (Merck).
Could lip licking mean a dental problem?
It can. Bad breath, drooling with blood-tinged saliva, pawing at the mouth and the approach-avoidance reaction at the food bowl are mouth-related signs that need an oral exam (Merck).
What if my cat has string in her mouth?
Thread or string caught under the tongue causes drooling and reluctance to eat, and it can go undiscovered unless the mouth is carefully examined. Do not dig for it yourself — the veterinarian removes it (Merck).
When should I call the vet about lip licking?
If the signs do not resolve within 24 hours, if vomiting starts, or if she has not eaten for 24 hours or more, contact your veterinarian as soon as possible (PetMD).