Photo: Blood in vomit is always a sign to call your vet. Important: If your cat is vomiting blood right now, call your veterinarian or emergency animal hospital immediately. This article is for information only and does not replace professional veterinary care. I’ll be honest. The first time I saw blood in my cat’s vomit, my stomach dropped. One second everything was normal. Next, there was a red spot on the carpet and a cat looking at me like, “What?” If you’re reading this, you’re probably scared too. That’s okay. Let’s walk through it together. Vomiting blood isn’t normal for cats. Ever. The medical term is hematemesis, and it just means there’s bleeding somewhere in the digestive tract. The color matters. Bright red usually means fresh bleeding from the mouth, throat, or upper stomach. Dark brown or black, coffee-ground-looking stuff means the blood has been in the stomach a while and has started to digest. Neither one is good. Both mean your cat needs to be checked.
Why Is My Cat Throwing Up Blood? The Most Common Reasons
There are a lot of possible causes. Some are minor. Some are serious. A vet is the only one who can tell you which one you’re dealing with.
Here are the 8 reasons vets see most often:
1. Upset Stomach or Stomach Ulcers
Just like us, cats can get irritated stomachs. It might be from eating too fast, eating something that didn’t agree with them, or stress.
It can also be from medication. Human painkillers like ibuprofen and naproxen are extremely toxic to cats and can cause ulcers that bleed. Even one pill can do real damage.
Cats with stomach irritation often vomit, seem uncomfortable, and don’t want to eat. If the lining gets damaged enough, it bleeds.
2. They Ate Something They Shouldn’t Have
Cats are curious. And they put things in their mouths.
String, hair ties, plastic, bones, grass, and toy parts. These things can scratch or cut the throat, stomach, or intestines on the way down. That causes bleeding.
String is especially dangerous. If you ever see string hanging out of your cat’s mouth, do NOT pull it. That can saw through their intestines. Get to the vet.
3. Injury or Trauma
A fall from a cat tree, a rough play session, a car accident, or a fight with another animal can cause internal injuries.
Sometimes the injury is obvious. Sometimes it’s not. But internal bleeding can show up as blood in vomit hours later.
Even small cuts inside the mouth or throat from chewing something sharp can do it.
4. Parasites
Hookworms and roundworms latch onto the intestinal wall and feed. That damages the lining.
Kittens and outdoor cats are most at risk. Other signs usually include diarrhea, weight loss, and a dull coat.
The good news is parasites are treatable. The bad news is if you ignore it, the bleeding and anemia can get bad.
5. Poisoning or Toxins
This one is scary because it can happen so fast.
Common household dangers include:
- Rat and mouse poison—it stops blood from clotting
- Lilies – extremely toxic to cats
- Human medications
- Cleaning products
- Some houseplants
ASPCA Animal Poison Control has a full list. If you think your cat got into anything toxic, call them and your vet right away. Don’t wait.
6. Cancer
I know this is the one no one wants to think about.
Tumors in the stomach, esophagus, or intestines can bleed. It’s more common in older cats, 10+, but younger cats can get it too.
Cancer doesn’t always mean the end. Many cats do well with treatment. But early detection makes a huge difference.
7. Blood Clotting Problems
Some cats have trouble clotting blood because of liver disease or a genetic condition. Others get exposed to rat poison, which does the same thing.
When blood can’t clot properly, even minor irritation turns into major bleeding.
8. Severe Infections
Viruses like feline panleukopenia and bad bacterial infections can inflame the entire digestive tract. That inflammation can lead to bleeding and vomiting.
These cats are usually very sick. Lethargic, feverish, not eating.
Other Signs That Go With It
Rarely is vomiting blood the only symptom. Your cat is trying to tell you something’s wrong. Watch for:
- Being tired or weaker than usual
- Not eating or drinking
- Pale gums—lift the lip. Healthy gums are pink, not white
- Losing weight
- Black, tarry poop
- Diarrhea, sometimes with blood in it
- Hiding, crying, or seeming painful
- Drooling a lot or pawing at the mouth
If you see any of these with blood in vomit, that’s your cue to call the vet now.
What To Do If You See Blood In Your Cat’s Vomit
First, breathe. Panicking won’t help your cat. Acting fast will.
Here’s what I tell every cat owner:
1. Take a photo
I know it’s gross. Do it anyway. The color, amount, and whether there’s food in it helps your vet a ton.
2. Check your cat
Are they alert? Eating? Drinking? Using the litter box? Any other weird behavior? Write it down.
3. Do NOT give human medicine
No Pepto. No Tylenol. No ibuprofen. These can make things worse or be fatal to cats.
4. Call your vet immediately
Tell them exactly what you saw. They’ll tell you if you need to come in right away or if you can monitor and come in the morning.
5. Go to the emergency room if:
- There’s a lot of blood
- Your cat is pale, weak, or collapsing
- They’ve vomited blood more than once
- They’re not responding normally
- You suspect poison
What The Vet Will Do
When you get to the clinic, they’ll want to figure out where the bleeding is coming from.
Expect some or all of these tests:
- Physical exam: Checking gums, belly, mouth
- Bloodwork: Looks for anemia, infection, organ problems, and clotting issues
- X-rays or Ultrasound: To find foreign objects, tumors, or internal injuries
- Endoscopy: A tiny camera goes down the throat to look inside the stomach
- Fecal test: To check for parasites
Treatment depends entirely on what they find.
- IV fluids if your cat is dehydrated
- Medication to coat the stomach and reduce acid if there are ulcers
- Antibiotics for bacterial infections
- Dewormer for parasites
- Surgery to remove something they ate or a tumor
- Hospital stay if they need close monitoring
Vets are good at this. The faster you get there, the better the odds.
Can You Prevent This From Happening?
You can’t prevent everything. Cats are cats. But you can lower the odds.
Cat-proof your house
Put away string, rubber bands, hair ties, and small toys. Keep medications in a cabinet. Move toxic plants out.
Watch what they eat
No human food without checking first. No garbage diving. Feed a good-quality diet that’s easy on their stomach.
Regular vet care
Annual checkups catch problems early. If your cat goes outside, keep up with deworming.
Know what’s toxic
Lilies, certain essential oils, and human drugs are huge ones. When in doubt, ask your vet before giving anything new.
When Is It a True Emergency?
I’m going to be direct. Go to the emergency vet right now if:
- Your cat is vomiting blood repeatedly
- There’s a large amount of blood
- Gums are pale or white
- Your cat is weak, wobbly, or unresponsive
- They’re breathing fast or hard
- You know or suspect they ate poison
- They haven’t eaten or drunk anything in 24 hours
Waiting “to see if it gets better” is the one mistake that costs cats their lives. If you’re unsure, call. A good vet would rather tell you it’s okay than have you wait too long.
Real Talk: The Fear Is Normal
Watching your cat be sick is awful. You love them. They depend on you. And you can’t just ask them what’s wrong.
It’s okay to be scared. It’s okay to cry in the car on the way to the vet. I’ve done it.
But you’re doing the right thing by looking this up and getting help. That’s what good cat parents do.
Final Thoughts
So why is my cat throwing up blood?
It could be something simple like stomach irritation. It could be something serious like poisoning or cancer.
The truth is, you won’t know until a vet looks. And that’s fine. That’s their job.
Your job is to notice and to act. Don’t ignore it. Don’t try to treat it at home.
Call your vet. Take your cat in. Most cats who get prompt care do really well.
You’ve got this. And your cat is lucky to have you.
FAQs
1. Why is my cat throwing up blood but acting normal?
Cats are experts at hiding pain. A single episode of vomiting blood could be from mild irritation. But it can also be early signs of ulcers, parasites, or something else. Always have your vet check, even if they seem fine afterward.
2. Is one time of vomiting blood an emergency?
Yes. Any blood in vomit should be checked by a vet. One time might be minor, but it could also be the first sign of a bigger problem. It’s better to be safe.
3. What if my cat vomits blood at night?
If your cat is weak, bleeding a lot, or vomiting repeatedly, go to the emergency vet. If it’s one time and they seem okay, monitor closely and call your regular vet first thing in the morning.
4. Can stress make a cat vomit blood?
Stress alone usually doesn’t cause bleeding. But stress can worsen stomach issues like ulcers, which can then bleed. Keeping your home calm helps, but it’s not a substitute for vet care.
5. What does it mean if my cat has diarrhea and is vomiting blood?
That combination can mean a serious infection, parasites, or poisoning. Treat it as urgent and contact your vet immediately.
6. What will the vet do to help?
They’ll run tests to find the cause. Treatment could be medication, fluids, dewormer, or surgery depending on what’s wrong. Many cats recover fully with proper treatment.
7. Are there home remedies for a cat vomiting blood?
No. There are no safe home remedies for this. Giving human medication or waiting can make things worse. Veterinary care is the only safe option.
Sources: ASPCA Animal Poison Control, VCA Hospitals: Vomiting in Cats