Why Is My Cat Vomiting? When Should I See a Vet?

Was it vomiting, regurgitation, coughing or a hairball?

These events can look similar, but the distinction changes the list of likely causes.

Why does my cat keep vomiting?

Vomiting describes a symptom, not a diagnosis. Your cat’s age, the timing of episodes and any other changes help narrow the possibilities.

Diet, eating behaviour and hair

Eating too quickly, a sudden food change, scavenging, food intolerance and swallowed hair can all be associated with vomiting. These explanations should not be assumed when episodes persist or other signs develop.

Parasites, inflammation and digestive disease

Parasites, gastritis, pancreatitis and chronic intestinal inflammation can cause intermittent or persistent vomiting. Some cats also develop diarrhoea, poor appetite or weight loss, while others show only subtle signs.

Disease outside the stomach

Kidney disease, liver disease, diabetes and hyperthyroidism can all cause nausea or vomiting. Increased thirst, changes in urination, appetite change and weight loss are particularly useful details to report.

Foreign material and obstruction

String, thread, elastic bands and small toys can obstruct or injure the digestive tract. A cat with an obstruction may vomit, stop eating, become quiet or develop abdominal pain. This can be life-threatening and requires urgent assessment.

Growths and infiltrative disease

Benign or malignant growths and diseases that thicken the stomach or intestinal wall can cause chronic vomiting. These possibilities cannot be distinguished from symptoms alone.

What does the appearance of cat vomit mean?

The contents can provide clues, but they cannot diagnose the cause on their own:

• Undigested food: note how soon it appeared after eating and whether there was retching
• Yellow or green fluid: may contain bile, especially when the stomach is relatively empty
• White foam or clear fluid: can occur with nausea but is not specific to one condition
• Hair: an occasional hairball can occur, but frequent episodes still warrant discussion
• Fresh red blood or dark coffee-ground material: seek prompt veterinary advice
• String, plant material or an unknown object: contact your vet urgently

Take a photograph before cleaning up if it is safe to do so. Do not rely on online colour charts to decide whether your cat needs care.

What should I record for my vet?

A short diary and a video of an episode can make the first consultation much more informative. Record:

• When the vomiting started and how often it occurs
• Its relationship to meals, drinking, medication or going outdoors
• Whether there is retching and abdominal effort
• What the material looks like and whether it contains food, hair or blood
• Appetite, water intake, urination, stools and recent body weight
• Any access to string, plants, human medication, chemicals or unusual food
• Current medicines, supplements, diet and parasite prevention

In a multi-cat household, temporary separation around meals and litter trays may help identify which cat is affected and what they are actually eating.

What tests might my vet recommend?

The first steps are a detailed history and physical examination. Your vet may assess hydration, temperature, mouth, thyroid region, abdomen, body weight and muscle condition.

Depending on the pattern and examination, investigations may include blood tests, urinalysis, faecal testing, thyroid testing, pancreatic markers, X-rays or abdominal ultrasound. No single fixed panel is right for every cat.

Supportive treatment may be needed at the same time, particularly if vomiting has caused dehydration or reduced food intake.

What if the first tests are normal?

Normal initial results can rule out or make some conditions less likely, but they do not explain continuing vomiting by themselves.

Your vet may recommend reviewing the diary, repeating selected tests, completing a properly planned diet trial or imaging the abdomen. If digestive disease remains a concern, tissue samples may sometimes be needed to distinguish inflammation from other conditions.

The most useful next step depends on what has already been tested, how often your cat vomits and whether there is weight loss, appetite change or another clinical finding.