Is Your Cat in Heat? The Signs and What You Should Know

For many animals, the reproductive cycle has clear signals. Female animals often enter a phase of being "in heat," more technically known as being in estrus, where they're receptive to mating and signal that receptiveness to other animals of their species around them.

Cats are one of the species that experience this cycle, along with dogs, horses, cattle, goats, and more. The question is, as a cat parent, what should you know about your cat going into heat, and what should you keep an eye on? Let's talk about it.

An Overview of the Cat Estrus Cycle

First, let's talk about the estrus cycle in cats. It can broadly be broken into four segments, which cycle back into the first when the fourth is finished.

The first stage is proestrus, which is when estrogen levels start to rise. It's entirely invisible to humans, but male cats can sometimes detect this rise. They might start to show a bit more interest in your female cat, but she won't be interested yet. This phase only lasts a couple of days.

The second stage is estrus, what we call being in heat. This can last anywhere from three days at the shortest to 21 days at the longest, though it usually only lasts for about a week. This is when your cat is in heat and will display behaviors relating to the bodily process. I'll talk more about those in a bit.

During this stage, your cat will either mate with a male cat or she won't. If she does, it will either result in a pregnancy or it won't. So, there are three possible outcomes.

• Pregnancy. In cats, this lasts about two months, after which you'll have a fresh new litter of kittens to enjoy.

• Metestrus. If your cat mates but no pregnancy occurs, this metestrus phase is a sort of cooldown phase that lasts 30-40 days before her cycle starts back up.

• Interestrus. If your cat doesn't mate, the interestrus phase occurs, which lasts 1-3 weeks.

After this phase, she will enter Anestrus, where hormones and behaviors return to normal. Then, if she's still in her cycle, it will restart with proestrus.

Cats only enter this cycle during certain times of the year, which is governed in part by seasonality and the hours of daylight they are exposed to. This means it's subject in part to geography, as well as weather and human conditions. If you maintain stable hours with a sunlamp, you might find that it has an impact on your cat's cycle.

Generally speaking, cat cycles start in the spring from February to April and continue through about October before tapering off for the winter. And hey, that makes sense; a predator doesn't want to have additional nutritional requirements, as well as hindered mobility and potential health issues, during the time of year when food is more likely to be scarce and the environment is more likely to be bad.

What Age Do Cats Start Going Into Heat?

Most cats enter this phase of their reproductive cycle somewhere around 5-9 months of age. Sometimes, kittens can start even earlier, as young as 3-4 months old, while others might go as long as 18 months before their first experience.

What makes the difference? It's a combination of factors. It can depend on their breed, their weight, and even the time of year.

On the opposite end of the scale, you might wonder if cats enter a menopause and stop this cycle when they reach a certain age. In actuality, they don't; their estrus cycle can continue well into their senior years and will be with them for the majority of their life. However, age-related issues like tumors, dysregulated hormones, and other problems can disrupt the cycle.

What are the Behaviors of a Cat in Heat?

If your female cat is entering the phase of her estrus cycle where she's "in heat," it will generally be pretty obvious. The behaviors are pronounced. However, first-time cat parents might not recognize what they're seeing.

The first and most obvious behavior is making a lot of noise. Female cats in heat make noises and vocalizations that, to be honest, can sound very distressing, like she's in pain. It's really just a mating call; she's letting male cats around her know she's up for grabs. It can be quite a change of character for usually quiet cats, though it might not be obvious if your cat is usually a chatterbox.

The second behavior, and arguably the most annoying of them all, is spraying. This is usually a male cat behavior, but female cats in heat might spray urine to mark their territory and spread around the scent that male cats will be attracted to. Unfortunately for us humans, it smells awful, and we really don't want it in the house.

Another behavior is simply restlessness. Your cat knows something is going on, and she wants something, and when she isn't getting it, she'll wander and look for it. She might hang out and pace areas where other cats hang out or spend time at a door or window where she can smell cats outside. She's on the prowl!

Another behavior, and one that can be concerning to new pet parents, is a lack of appetite. When your cat is in heat, she has one thing on her mind, and it's not food or drink. Keep a close eye on her, and make sure she's eating and drinking at least once every 12 hours; if not, take her to the vet.

There's a pretty good chance that she's also going to be very affectionate and seeking your attention. She'll rub her face against you a lot, wrap her tail around you as she passes by, and seek out cuddles and a lap to sit on. She might not stay long because of the restlessness, but the affection helps calm her down a little.

A few of the more physical signs include:

• Swelling of the vulva and genital area.

• Excessive grooming, especially of the genital area.

• Hanging out by the door and trying to escape when she gets the chance.

• Lifting her rear in the air while she poses. When all else fails, the open invitation is the best she's got.

One or two of these signs might be a coincidence, but if they represent a change from your cat's normal behavior, or when multiple combine, you've got a cat in heat.

What Can You Do About a Cat in Heat?

If your fur baby is in heat, you have to decide what you want to do about it.

One thing is certain: a cat in heat is, more often than not, an annoyance. She'll be noisy, needy, and might spray, which is awful to deal with. Not to mention, if she tries to escape, it's a danger to her and to local wildlife.

What you can do mostly depends on the outcome you want. There are, basically, three options.

Option One: Find a Mate

This option is the best option for breeders, usually of purebred cats. I'm generally not hugely in favor of breeders – there are so many strays and forlorn cats living in shelters that need your help already – but the fact is, there's a niche for them, and they aren't going away.

If your goal is kittens, you'll need a mate for your queen for the next litter. How you handle that depends on all sorts of different factors, including genetic testing, purebred certification, and other factors.

Option Two: Manage the Behaviors

If you like your cat the way she is, but you wish she'd tone it down a little, you can try to distract her and keep her from the worst and most annoying behaviors.

Consider things like:

• Setting aside a calm, isolated, comfortable space for her that is cloistered away from loud noises, distractions, and other cats.

• Dim the lights, draw the curtains, and try to keep things calm. Imagine she has a migraine, and you're on the right track.

• Keep her litter box clean and accessible. She's less likely to spray if she can use the litter box comfortably.

• Make use of toys, treats, and catnip while spending extra time to care for your fur baby while she's struggling.

• Stay patient, especially if she's young enough that this is disruptive to her training. It's a biological imperative, and there's not much you can do to stop it.

• Know when to leave her alone. Even if she's being extra affectionate, if she nips or swipes at you, she's probably serious about it, so don't bug her.

Make sure to be vigilant. If she tries to sneak out and escape when you bring in the groceries, you're going to have a heck of a time catching her. You also want to watch out for things like vaginal discharge or signs of an infection, which can be dangerous or life-threatening.

Option Three: Have Her Spayed

The third (and best) option is generally to have her spayed.

Spayed female cats don't go into heat unless the surgery wasn't successful or there's another issue, which I'll discuss a bit below. It's the only way to prevent a cat from going into heat.

Preventing estrus isn't the only reason to spay a cat, either. Spaying is important for her overall health. Spaying before her first cycle can reduce her chances of breast cancer by over 90% and can reduce the risk of ovarian, uterine, and other reproductive cancers as well. It also prevents uterine infections like pyometra, which can be fatal.

There are also side benefits. Cats with diabetes or epilepsy need medications to be healthy, but changes in hormones can disrupt those medications. Spaying her brings stability to those hormones.

Cats in Heat FAQ

Now, let's wrap things up with a few questions you might have that I didn't cover above.

My cat is spayed; why is she going into heat?

If your cat was spayed, she shouldn't be going into heat. If she is, there's a possibility that your vet missed some tissue when they performed the operation and that leftover tissue is causing the cycle of hormones to surge. It's called Ovarian Remnant Syndrome and will need another surgery to correct it.

There are a few other reasons why she might be exhibiting heat-like behaviors, too. Adrenal tumors produce hormones that can cause the cycle. An infection called a pyometra can also occur and cause symptoms. In some cases, if your cat is exposed to products containing estrogen, like topical creams or other drugs, it can cause similar effects as well.

The good news is that all of these require the same reaction: taking your cat to the vet to see what's up and figure out what to do next.

Can male cats go into heat?

Yes and no. Male cats don't go into heat because the estrus cycle is specifically related to female reproductive organs.

However, male cats do have their own behaviors, which are actually a reaction to female cat estrus; they might do more urine marking, they might be more restless, and they might try to escape to find a mate if one isn't available, but they can sense one nearby. Neutered males don't exhibit these behaviors, just like spayed female cats don't go into heat.

Is being in heat painful?

As any human woman can attest, the menstrual cycle can be immensely uncomfortable or painful. Is the same true for cats? Fortunately, no. Some of her behaviors are similar to how she'll act if she's in pain, but I promise she isn't.

She also won't have a period the way we do. There should be no blood involved in the process, so if you notice any, she might have a UTI or other issue you should talk to your vet about.

So, there you have it: a guide to cats in heat. Do you have any questions I missed? If so, be sure to let me know in the comments!