TL;DR: Blood in a cat's vomit is a high-priority medical emergency that requires immediate veterinary attention to address potential causes like toxins, ulcers, or obstructions. If safe, take a photo of the vomit to help the triage team assess the severity and prepare for your arrival.
What does it mean if there is blood in my cat's vomit?
Finding blood in your cat's vomit, medically known as hematemesis, indicates bleeding somewhere in the upper gastrointestinal tract. This can include the esophagus, stomach, or the first part of the small intestine. The blood may appear as bright red streaks, which indicates fresh bleeding, or it may look like dark, grainy coffee grounds, which suggests the blood has been partially digested by stomach acid.
Is blood in my cat's vomit a medical emergency?
Yes, this is considered a high-priority medical emergency. While cats occasionally vomit due to hairballs or dietary indiscretion, the presence of blood is never normal. It can be a sign of several serious conditions:
- Severe inflammation or gastrointestinal ulcers
- Ingestion of toxins, such as rat poison
- Foreign body obstructions
- Internal tumors
You should contact an emergency veterinarian immediately, especially if your cat exhibits these additional symptoms:
- Lethargy or extreme weakness
- Pale gums
- Refusal to eat
Why should I take a photo of the vomit for the veterinary triage team?
If you are able to do so safely, take a clear photo of the vomit before cleaning it up. This visual evidence is a powerful tool for the veterinary triage team, as it allows them to:
- Assess the total volume of blood lost
- Analyze the specific appearance (fresh vs. digested blood)
- Determine the precise level of urgency
- Prepare the necessary diagnostic tools before you even arrive at the clinic
Clinical Context (Merck Veterinary Manual)
In cats, vomiting blood (hematemesis) can manifest as frank blood or have a coffee-grounds appearance, indicating a bleeding lesion such as a gastric ulcer or neoplasm. Common causes of vomiting include dietary indiscretion, drug or toxin ingestion (e.g., antibiotics, NSAIDs), systemic illness (e.g., pancreatitis), endoparasitism (e.g., Ollulanus sp), or bacterial (e.g., Helicobacter) or viral (e.g., feline panleukopenia) infections. A specific diagnosis should be pursued if hematemesis is present, the animal is systemically unwell, or clinical signs do not resolve within 2 days of symptomatic therapy. Diagnostic steps include a thorough history, clinical findings, and if necessary, a CBC, serum biochemical profile, urinalysis, and diagnostic imaging.
Chapter: Gastroenterology, Infectious Disease
Source: The Merck Veterinary Manual, 11th Edition (Page 156)