One-sided cheek swelling for days?

That pattern can be dental — still needs a vet, usually not the same as sudden allergic swelling, but do not ignore it.

That pattern can be dental — still needs a vet, usually not the same as sudden allergic swelling, but do not ignore it.

Cat face swelling

Sudden swelling gets a prompt call. Open-mouth breathing gets the ER.

Scenario	Sudden facial swelling
Vet vs poison control vs ER	Facial swelling with normal breathing may be an urgent same-day vet visit; swelling with breathing change, collapse, or vomiting is ER now. Poison control helps if a toxin or drug overdose is the suspected trigger.

Note any new food, insect sting, vaccine, or medication in the last hours
Check for difficulty breathing, retching, or spreading hives
Keep the pet calm and avoid forcing the mouth open
Call your veterinarian or ER promptly for facial or muzzle swelling
Do not give human allergy medications unless a veterinarian directs a specific dose for this pet

Stings, vaccine reactions, and dental abscesses can all change facial shape. Timing helps.

Do not squeeze swollen areas.

Minimize stress. Carrier ready.

Mention any new food, plant, or bite history.

This is general information, not a diagnosis. Contact your vet for anything urgent or unclear.

One-sided cheek swelling for days?: That pattern can be dental — still needs a vet, usually not the same as sudden allergic swelling, but do not ignore it.