Skip to main content

Why is my cat aggressive all of a sudden? We have answers

Here's what's behind sudden cat attacks

Scary striped cat hissing
Radysh / Shutterstock

You’re just sitting on your couch, scrolling through your phone, and looking at old photos of Grumpy Cat (RIP). Out of nowhere, your cat jumps on you — and it’s not to cuddle. Their claws are out, and they’re hissing. Then, they go in for a bite.

After muttering a few words you can’t say in polite society, you may wonder, “Why is my cat aggressive all of a sudden?”

Recommended Videos

After all, you got up on your cat’s terms — at 5 a.m. — and fed them. The litter box is clean. If your cat is usually sweet or neutral towards you, sudden aggression may catch you off guard. You may also worry. Your kitty may be a fraction of your size, but infected scratch marks and bites can cause cat scratch fever, which may lead to flu-like symptoms.

In other words, you’ll want to figure out what triggered the episode so you can avoid it in the future. Let us help you play detective.

a gray cat with green eyes on a black background
iqbal bamarouf / Shutterstock

Why did my cat attack me for no reason?

Cat aggression happens more than you may think. Behaviorists say it’s the second-most reported behavioral challenge they see in kitties. You may believe you’ve done everything right — and you are certainly trying your best — but there’s usually a reason behind it. A few common reasons for cat aggression are:

  • Play. Some cats didn’t spend much time around their littermates — perhaps their mother abandoned them. As a result, they may try to play rough by hiding and stalking you before pouncing on you.
  • Fear. Scared cats can become aggressive as a means of protection. Your kitty may have heard a loud noise, or perhaps they do not want to get in their kennel to go to the vet.
  • Petting. Petting-induced aggression occurs when a cat doesn’t enjoy those snuggle sessions as much as you do. It’s unclear why some felines display petting-induced aggression, but it can rear its ugly head if the cat is overstimulated or during grooming sessions.
  • Redirected aggression. It may not have been anything you did at all. This type of aggression happens when the cat can’t take its aggression out on the direct source, like a stray kitty in the backyard, so you become the scapegoat.
  • Pain. Sometimes, cats become aggressive if they are in pain. They may hiss, especially if you touch the area that hurts.
  • Territory. Cats have their spaces. If you infringe on a spot they covet, they may become aggressive.
A calico cat with her ears flatten glares at a gray and white cat.
Gurkan Ergun / Shutterstock

Why did my cat get randomly aggressive?

Though cat aggression is common, it may be rare for your pet. An attack can feel random, but your fur baby may have been sending you signals of their displeasure for a while. Could you possibly have missed one of these warning signs?

  • Dilated or constricted pupils
  • Stiff stance and tail
  • Direct stare
  • Growling, howling, or yowling
  • Raised hackles
  • Bushy tail
  • Crouching
  • Tucked head
  • Retracted whiskers

Keep an eye on your pet’s body language moving forward. If it continues to happen with seemingly no warning, you’ll want to visit your vet to see if the pet has an underlying condition causing sudden aggression.

a gray and white cat yawning
itsfahran / Shutterstock

How do you stop sudden aggression in cats?

You love your cat and can forgive their transgressions, but understandably, you want to nip this aggressive behavior in the bud. Here are some ways to do so:

  • Distract the cat. Aggression isn’t always so sudden. If the cat displays signs of aggression, try throwing something like a beloved toy toward them to redirect their attention.
  • Play with them. Sometimes, bored cats can become overstimulated as they attempt to entertain themselves. Keeping them entertained, such as through play, can prevent sudden aggression and enhance your bond.
  • Give them space. You probably have a safe space to go when you are feeling stressed. Your cat deserves the same. A cat cave, window perch, or tall tree can allow them to feel secure. Also, make sure they have their own place for their food.
  • Visit the vet. Your cat may have pounced because they aren’t feeling well. A thorough vet exam can rule out — or help catch — any conditions.
  • Call a pet behaviorist. A behaviorist who specializes in cats can help you identify what’s triggering your cat’s aggression and give you tips to help Kitty cope.
Grey and white cat eating catnip out of a plastic bottle
Creative Cat Studio / Shutterstock

Will catnip calm an aggressive cat?

If your cat pounces, it might be a little too late to reach for the catnip, but supplements can help manage kitty anxiety. Some pet parents prefer treats with catnip and CBD for best results (make sure to purchase from a reputable source). When your sweet pet starts to seem nervous or you know in advance that there will be a trigger, try out a few different options to see what sticks. It’s possible your feline will have an obvious preference or that you’ll notice a big difference. Still, helping your cat deal with her symptoms isn’t a substitute for diving into the deeper underlying causes.

An orange cat meowing
Didgeman / Pixabay

Our final thoughts on aggressive cat behavior

If your usually sweet feline attacks you unprovoked, you may wonder, “Why is my cat aggressive all of a sudden?” The truth is, cat aggression often isn’t random, even if it feels that way to you. Cats typically display signs they’re upset about something before they attack. Body language cues include a change in pupil size, crouching, direct stares, and a stiff posture and tail.

There are several reasons for cat aggression, including fear or pain. Try distracting the cat with a favorite toy when you notice signs of irritation. Giving them space and playing with them can also help reduce stress. If you’re unsure what’s going on, take your kitty to the vet. They may be sick or in pain, and the aggressive episode was their way of trying to tell you since the two of you don’t speak the same language.

BethAnn Mayer
Beth Ann's work has appeared on healthline.com and parents.com. In her spare time, you can find her running (either marathons…
Why do cats hate closed doors? What science says
Your cat has a few reasons for following you into the bathroom
Cat sits in the bathroom looking out

Every cat owner knows that living with a feline means never having privacy. They follow you into the bathroom, the bedroom, and of course, the kitchen. Any door you're behind, in particular, becomes a cat nemesis. But why do cats hate closed doors? It turns out that the answer, like so much of pet behavior, comes from a complex place of modern living and ancestral instincts. Here's what you need to know about why your kitty detests you shutting them out and what you can do to keep your paint intact.
Why do cats hate closed doors?

When you go to the bathroom and shut the door, you might instantly hear the sounds of a cat positively shredding the outside (see also velcro dogs). It's not just that they want desperately to be near you, though. Cats have a unique perspective on their own space and a need to control it. After all, your house is theirs, too.

Read more
How to help your new cat settle in
Here are the steps you should take to help your cat feel at home with you
Tiger cat lying on a rug

Bringing home a new cat can be stressful for both you and your new furry family member. Fortunately, there are many ways you can help reduce your cat's stress and make the transition period easier. As your new cat settles in, he'll need some support from you, but he'll also need you to be patient with him. He's undergoing a big life change, and as excited as you are for him to be around, the best thing you can do is to give your kitty some time and space while he adjusts. He'll be roaming the house and hanging out with you soon enough if you follow these tips.
What is the 3-3-3 rule for cats?

If you have ever adopted a cat before, you may have heard this often-cited rule for settling in. The rule says that cats take three days to adjust to being in a new place at all and may seem especially hesitant and skittish.

Read more
8 halloween cat names you’ll love for spooky season and all year
Deck your black, white, or orange kitty up in fall style with a name to match
Cute cat in Halloween costume

If you're anything like us, you love Halloween — and so does your cat. A black, white, or orange critter will stand out this spooky season, complete with costume and a name that's on theme. This could look like a Jack dressed up as a jack-o'-lantern or a Maleficent wearing a cute witch hat. Anyone who loves this fall holiday will enjoy calling their kitty by an All Hallows' Eve style moniker year round. Here are the best Halloween cat names that we recommend for any creature.
Best Halloween cat names

Our list of names runs the gamut from pop culture to ancient. We're giving you the top choices so you can select the purrrfect one for your furry friend.
Cobweb
We absolutely adore this label for a kitty, especially because it's the name of the feline in Hocus Pocus 2. You might pick out this one for a black cat with particularly cool markings that will lend itself well to the theme.
Octo
The eighth month is eerie, and so this name fits perfectly for a sneaky cat who loves to pounce when you least expect it. This name could also work for a darling mouser that has eight distinct spots or a similar pattern.
Samhain
Give your fur ball a throwback with this pagan name that used to begin the night of October 31 and lead into the next day. Traditionally pronounced "Sowen," you can say it any way it rolls off the tongue.
Carrie
This one works well for someone who doesn't want their cat's identity permanently tied into October festivities. But every year around the fall, you'll get to go full Stephen King and break out your bloody decorations.
Salem
Made famous in the show Sabrina the Teenage Witch, Salem is a talking cat, and of course, the site of one of the deadliest witch trials in American history.
Black Phillip
A good fit for a feline that's all black with a gung-ho personality to boot -- name your cat after the goat from the movie The Witch and dress them up in horns for the occasion.
Elphaba
Give Wicked a try by adorning your cat with the main character's name, which is handy because you can also refer to them as the Wicked Witch of the West whenever that title applies.
Candy Corn
Last but not least, we have a lot of good names for black cats here, so we wanted to throw one in for the ginger fellows. Any orange and white striped cat would love to go by this famous candy.

Read more