Periods come with a lot of stuff no one really talks about. Cramping? Annoying. Mood swings? The worst. But let’s talk about something a little less discussed (and maybe a bit awkward): smelly period blood.

If you’ve ever wondered, “Wait, is that smell coming from my period?”, you’re not alone. Most of us have had that moment of panic when we head to the bathroom and notice things are a little... off. 

First off: Yes, period blood can have a smell

Here’s the thing, blood does have a scent. So, when it mixes with other things like vaginal discharge, bacteria, or even leftover menstrual products, that scent can become more noticeable. But that doesn’t automatically mean something’s wrong.

Period blood isn’t “just” blood, it’s a mix of uterine lining, mucus, and bacteria. When exposed to air (like on a pad or liner), that combo can smell metallic, musty, or even a little sweet. Totally normal.

Why does my period blood smell sweet?

Sometimes, the mix of blood and natural vaginal bacteria gives off a slightly sweet or even iron-like scent. It can be weird the first time you notice it, but it’s usually nothing to worry about. Bodies are weird and wonderful, and everyone’s natural scent is different.

That said, if this sweet smell comes with other symptoms (like itching, unusual discharge, or discomfort), it’s worth chatting with a healthcare provider to rule out infections like BV (bacterial vaginosis).

What if my period smells bad?

So, you're wondering, why does my period smell so bad sometimes? If it’s a strong, foul, or fishy odour, especially if it’s new or unusual for you, that might be your body’s way of waving a red flag.

Some common reasons include:

• Forgotten tampon or pad: Hey, it happens. If something’s left in too long, it can cause an intense odour (and increase infection risk). It’s also important to change tampons regularly to lower the risk of Toxic Shock Syndrome (TSS), a rare but serious condition. If you think this could be the case, don’t wait, remove it ASAP and see a doctor if anything feels off.
• Infections: Things like bacterial vaginosis or STIs can cause strong odours, especially during your period when your vaginal pH changes.
• Hormonal shifts: Your hormones do all sorts of wild things during your cycle. Sometimes they change your natural scent especially if you’re on hormonal birth control.

What are the most common period blood smells, and what do they mean?

With so many different factors that can lead to a whole range of period blood smells, let’s dive into some of the types you may notice and what they can mean:

• Metallic period blood smell: Lowest on the list of cause-for-concern, metallic smelling period blood is normally due to the presence of blood, specifically, the iron in the blood. It should disappear shortly after your period ends.
• Sweet smelling period blood: A sweet smelling period isn’t actually a scent from the blood itself. It is more than likely due to the presence of bacteria in the vagina and the pH level at the time. Not usually a cause for concern!
• Body odour period scent: If your period has a body odour type of smell, a bit like your underarms after a serious sweat session, this is because we do have sweat glands down south (known as, apocrine sweat glands). But rather than through exercise, these glands are actually activated by stress or anxiety - so it’s a good idea to get in some R&R!
• Fishy period smell: A fishy period smell means that there’s most likely something amiss downstairs. It can be indicative of an infection, like bacterial vaginosis (aka BV) or trichomoniasis (an STI). If you notice a fishy period smell it’s best to book in with your GP for an assessment!
• Rotten smelling period: If you notice especially smelly period blood reminding you of a rotten scent, this could indicate a vaginal issue. A foul smell of period blood is often because of a foreign body, such as a tampon, that’s been left too long in the vagina. The best course of action here is to remove the tampon (if there is one) and make sure to contact your GP if the rotten period blood smell persists.
   

Is a smelly period something to stress over?

Most of the time? Nope.

A smelly period isn’t usually a sign of anything serious. Your period has a scent because your body is doing its thing, shedding the uterine lining, managing bacteria, and adjusting hormone levels. That said, you know your body best. If something smells totally different from usual or comes with other symptoms (like itchiness, pain, or a change in flow), it’s smart to get it checked.

How to keep things feeling fresh

If the scent is bothering you (even if it’s totally normal), here are a few easy tips:

• Change products regularly: Whether you use pads, tampons, or a cup, changing them often helps prevent odour buildup.
• Skip scented stuff: Scented pads or sprays might seem helpful, but they can mess with your natural pH and cause irritation.
• Breathe-friendly underwear: Period undies and loose-fitting clothes help with ventilation and moisture control.
• Stay clean - gently: Use warm water to clean your vulva (the outside bits). Avoid douches or soaps inside the vagina, it’s self-cleaning!

FAQs:

What causes a smelly period?
A combo of blood, discharge, bacteria, and exposure to air. It’s usually normal, especially if it smells metallic or slightly sweet.

Does birth control affect period smell?
It can! Some people on birth control (especially hormonal methods) notice changes in their vaginal scent. It’s linked to shifts in pH and hormones.

When should I see a doctor?
If the odour is strong, fishy, or comes with itching, burning, or weird discharge, it’s worth getting checked.

Can certain foods affect smell?
Yes! Foods like garlic, onions, and spicy dishes can sometimes influence body odour including vaginal scent.

Is it bad hygiene if my period smells?
Not at all. Period blood just has a natural scent. As long as you are changing products regularly and washing gently, you’re doing great.

The bottom line?

Your body isn’t gross, it’s just doing its job. If your period smell is stressing you out, take a breath. Most of the time it’s completely normal, but don’t hesitate to check in with a doc if you’re unsure. There’s no such thing as a TMI question when it comes to your health.

Love, Libra x 
Essity makes no warranties or representations regarding the completeness or accuracy of the information. This information should be used only as a guide and should not be relied upon as a substitute for professional, medical or other health professional advice.