Why vomiting changes the vet's approach
When a cat vomits after eating citrus, the vet prioritizes checking for dehydration and chemical irritation. The stomach acid combined with lemon's oils creates a harsh mix that can inflame the esophagus. Your cat's single vomit suggests mild exposure, but the vet will still examine her gums for redness and test skin elasticity to gauge fluid loss.
Blood work becomes more likely if she shows lethargy or refuses water. A basic panel tracks blood sugar dips from stress and screens for electrolyte imbalances caused by vomiting. For a wedge this size, hospitalization is rare—most cats go home with anti-nausea injections and instructions for bland meals.
The critical 8-hour window post-vomit
After the initial vomit, watch for secondary waves of nausea as the lemon moves through her system. Cats often drool excessively or smack their lips when stomach acids reflux. Keep her in a quiet space with easy access to a litter box—diarrhea may follow within six hours if the peel oils irritate her intestines.
Hydration matters more than food right now. Offer ice chips or shallow water bowls to encourage drinking without overwhelming her stomach. If she hasn't kept down liquids by hour eight or develops tremors, return to the vet immediately—these signal worsening metabolic disturbance.
What the vet's physical exam reveals
During the exam, the vet will press along your cat's abdomen feeling for tension or pain behind the ribs. Lemon acidity sometimes causes gastritis—stomach lining inflammation—which manifests as flinching during palpation. They'll also sniff her breath for citrus odor lingering in regurgitated fluids.
Oral inspection focuses on tongue and gum color. Pale pink suggests good circulation, while bright red streaks indicate chemical burns from the acid. The vet may swab her mouth with neutralizing solutions if they find ulcerations, though small wedge exposures rarely cause severe tissue damage.
Transitioning back to normal food
Once your cat stops vomiting, introduce food slowly over 48 hours. Start with teaspoon portions of plain boiled chicken every three hours—the protein is easy to digest and helps rebuild stomach lining. Avoid fish or dairy-based recovery foods, as lemon compounds can temporarily alter how she processes fats.
Watch stool consistency when resuming regular meals. Loose bowels persisting beyond two days warrant a recheck—prolonged gastrointestinal upset risks dehydration in cats. Most rebound fully within three days, but alert the clinic if her energy lags or she avoids her food bowl.
The full verdict, portion guidance and serving notes are collected on the Lemon food facts page.