Get

In Your Inbox

Catster is reader-supported. When you buy via links on our site, we may earn an affiliate commission at no cost to you. Learn more.

Dealing With an Aggressive Cat? 7 Reasons Why Cats Become Aggressive

owner petting a hissing angry tabby cat

Even the most experienced cat caretakers can find themselves charged up on adrenalin when having to face a cat in the midst of a fit of aggression. But encountering a hissing, growling, screaming, and possibly even scratching and biting cat can strike terror into the hearts of people who don’t know how to handle an aggressive cat.

But cats don’t just suddenly go crazy: There are almost always warning signs and there’s almost always a good reason for cat aggression. Here are seven reasons why cats become aggressive and how to handle an aggressive cat.

divider 3 paws

The 7 Main Reasons Cats Become Aggressive

1. Cats Become Aggressive Because They’re in Pain

Cats who are in pain will respond with hisses and swats when sensitive areas are touched. My cat, Siouxsie, does this if I accidentally put pressure on her sore hips. A hard yank on the tail, for example, can be quite painful. Ignore the warning signs and a scratch and possibly even a bite may follow. This is especially true if the pain is a result of physical abuse such as being kicked or hit.


2. Fear Can Cause Cat Aggression

A terrified cat will respond with body language that’s obvious to an experienced cat caretaker: She will turn sideways and puff up her tail and fur in order to look larger. Her ears will flatten backward, she will hiss and her pupils will dilate. Attempting to approach a cat in this state is risking an aggressive reaction, not because the cat dislikes you but because she’s in the middle of a panic reaction.

An angry cat growling, hissing or hiding.
An aggressive cat might be responding to pain. Photography ©points | Thinkstock.

3. Hormones May Cause a Cat to Become Aggressive

A cat who is not spayed or neutered is much more likely to be aggressive. Male cats in particular are biologically wired to fight with other male cats when females in heat are present. If you see two cats fighting, do not physically intervene because you will almost certainly become the target of the cats’ aggression.


4. Cats Can Get Aggressive Due to Frustration

“Redirected aggression” is the term for violent acts carried out by cats because they can’t reach the object of their predatory passion. For example, an indoor cat who sees another cat walking by or marking his territory in “his” turf may get into a highly reactive state. At that point, anyone unfortunate enough to be nearby, whether that’s another cat, a dog or a person, may end up on the receiving end of the cat’s aggression.

A kitten hissing with his ears flattened back.
Image Credit: Ornitolog82, Thinkstock

5. Cat Aggression Happens Due to Stress

If a cat lives in a highly stressful environment — for example, a home in which people are fighting or a home with too many cats — it’s quite possible for that cat to be quick to respond aggressively. Like children who live in homes with a lot of verbal and physical violence, or a lot of unspoken anger, cats often act out the dynamics of their human families.


6. An Aggressive Cat Might Be Responding to Trauma

Don’t laugh: Cats can suffer from post-traumatic stress. Their brains are wired similarly to ours, and the effects of chronic anxiety from past human violence or struggling to survive on the streets can lead cats to become aggressive. To resolve this issue, a short course of anti-anxiety medication (prescribed by a vet, of course; don’t give your cat your antidepressants, please), homeopathic remedies or flower essences can help make a cat less reactive to triggers. Ask a veterinarian for more options on how to successfully and naturally calm your cat.

If you need to speak with a vet but can't get to one, head over to PangoVet. It's an online service where you can talk to a vet online and get the advice you need for your pet — all at an affordable price!

PangoVet_Mention-in-Content for PangoVet2 save money


7. Chemical Imbalances Can Cause Cat Aggression

This is by far the rarest reason for cats to become aggressive. But like humans, some cats simply have biochemical imbalances that affect behavior. For these cats, antidepressants or anti-anxiety medications can be a lifesaver.

Related: Do You Have an Aggressive Cat — or Just a Brat?!

divider 3 paws

The bottom line on handling an aggressive cat

No matter what the cause of the aggression, there are almost always warning signs. If you understand feline body language, you will be able to see that your furry friend is getting wound up before the situation escalates to a crisis point. If you have a highly reactive cat and you want to help him or her, be aware that it will take time and patience — but take it from a person who has rehabilitated traumatized cats: The reward is so worth the effort!

Related Reads:


Featured Image Credit: Anna Kraynova, Shutterstock

Want content like this delivered to you?

Sign Up For Our Newsletter

News, insights, expert advice, and everything cat

* By submitting, you agree to our Terms & Conditions and Privacy & Cookies Policy.

How useful was this post?

Click on a star to rate (you can leave written feedback after clicking submit)

Help us improve Catster for pet parents!

Your feedback really matters.

What did you like about this post? Also how can we improve it?

Join the conversation

Leave a Reply

You’re very welcome to leave a comment or question. Please know that all comments must meet our community guidelines, and your email address will NOT be published. Let’s have a positive and constructive conversation.

Talk With A Vet Online

Peace of mind,
anywhere, anytime

Affordable vet advice

8 Brown Cat Breeds (With Info & Pictures)

Cats are one of America’s favorite pets. They come in various coat patterns, and while most tend to be black, grey, or orange,...

How Much Does It Cost to Cremate a Cat: 2025 Update

After a cat’s death, several decisions must be made, including what to do with their body. Planning ahead is vital, and the overwhelming...

Do Feral Cats Like Catnip? Vet-Approved Facts & FAQs

If you’ve ever watched a cat go crazy over catnip, you may be surprised to learn that some cats are completely indifferent to...

Bengal Cat Breed: Info, Pictures, Temperament & Traits

Bengal Cats are one of the most intriguing cat breeds available today. They look like tiny leopards and have a personality that can...

More related

Can Cats Eat Nectarines? Vet Approved Nutritional Facts & FAQ

It’s usually pretty adorable when a cat goes for a treat that you wouldn’t expect them to enjoy. Between fruits, vegetables, snacks, and...

Persian Kittens For Sale in Virginia: Breeders List 2025

Catster advocates for adopting before shopping, though we fully understand there are many reasons for seeking a breeder. So, we encourage it to...

10 Best Cat Trees Under $50 in 2025 – Reviews & Top Picks

No one wants to see giant shred marks in their favorite upholstery, but elaborate cat trees can be expensive. Now, you don’t have...

How to Grow Cat Grass Without Soil: Step-by-Step Guide

Many cat owners like to grow cat grass for their cats. It adds essential fiber to your cat’s diet, which can prevent the...

Keep reading

Can Cats Eat Beef Wellington? Vet-Reviewed Risks & Alternatives

Beef Wellington is a popular dish for the holidays or dinner parties. It is an impressive dish to make, and you may want to share it with your cat. However, Beef Wellington isn’t safe for cats to eat. While it...

Can Cats Eat Beef Wellington

Why Does My Cat Eat My Hair? 9 Reasons for This Behavior & Vet-Approved Tips

If you find yourself asking “Why does my cat eat my hair?”, you’re not alone. Out of all the odd cat behaviors, your feline chewing on your hair is probably one of the strangest. Your hair is not a very...

cat sitting behind the man licking his head

Is Vinegar Bad for Cats? Vet-Reviewed Safety Concerns

Vinegar is one of the wonder products many regularly use for different purposes such as cleaning. So, is vinegar bad for cats? Vinegar is incredibly acidic and can irritate their mucous membranes if consumed undiluted. However, if it’s mixed with...

Is Vinegar Bad for Cats

How to Sedate a Cat for Car Travel: 3 Effective Methods & Application Tips

Preparing for a long-distance car trip with your cat can feel like planning a road trip with a reluctant passenger. Many cats dislike travel, and keeping them calm and comfortable for hours on the road might seem daunting. While sedation...

Cute grey cat inside pet carrier in car

Why Does My Cat Lick My Armpits: 5 Vet-Reviewed Possible Reasons

Cats are wonderful, but most people who’ve ever loved one of these perfect creatures had at least one moment when they wondered: what on earth is my cat up to and what could have possibly possessed the animal to do...

cat licking its nose

How Does Hairball Control Cat Food Work? Vet-Approved Facts & FAQ

Watching a cat groom itself is such an interesting and strangely soothing sight. They look so relaxed while they groom, not to mention the funny positions they manage to get themselves into. What isn’t very soothing or fun, though, is...

siamese cat eating food from bowl at home

Kitten Suckling: Vet-Reviewed Behavior Facts & FAQ

If you’ve brought a new kitten into your home, you might have noticed your kitty sometimes engages in what can seem like odd behavior. Whether it’s crazy cat time or a penchant for trying to eat their tail, kittens (and...

A cat sucking on a blanket.

Are Tomato Plants Toxic to Cats? Vet-Reviewed Houseplants Examined

There’s nothing more exciting than welcoming a new cat into your life. Having a pet involves taking good care of it and buying the proper cat food, plenty of kitty litter, and some toys. If you plan on allowing your...

Catster_Are Tomato Plants Toxic to Cats