You go to change your tampon or pad and spot something that gives you pause: a small, jelly-like clump in among the blood. Cue a little jolt of "wait - is that meant to happen?"
Here's the reassuring headline: menstrual blood clots are usually completely normal.
But because "usually" isn't "always", it's worth knowing what's typical, what's worth keeping an eye on, and when it's time to check in with a doctor. Let's walk through it together.
What are period clots, exactly?
Your period isn't just blood - it's a mix of blood, tissue from the lining of your womb and natural secretions. Your body produces anticoagulants that help keep menstrual blood flowing smoothly. But when your flow is heavier or faster than those anticoagulants can keep up with, some of the blood coagulates on the way out. The result is a clot: a small, gel-like clump, often darker or brighter red.
In other words, clots are largely a sign of how quickly the blood is leaving - not something foreign or alarming in themselves.
What's normal
For most people, the following are perfectly ordinary:
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Small clots - roughly the size of a coin or smaller.
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Clots on your heaviest days, usually days one and two, when flow is fastest.
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Darker or brighter red clots, especially first thing in the morning after lying down overnight, when blood has had time to pool.
If that's what you're seeing, there's generally nothing to worry about. It's just your period doing its thing.
What's worth paying attention to
It's a good idea to keep an eye on things - and speak to a healthcare professional - if you notice:
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Large clots - bigger than about a 2p coin (roughly 2.5cm), appearing regularly.
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Very heavy bleeding alongside them: soaking through a pad or tampon every hour or two for several hours, needing to double up on protection, or bleeding that disrupts your daily life.
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A sudden change from what's normal for you - clots or heaviness that weren't there before.
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Clots with severe pain, dizziness, or unusual tiredness (which can be a sign of low iron from heavy bleeding).
None of these mean something is definitely wrong - but they're your body's cue to get things checked rather than wonder.
What can cause heavier flow and clots?
Lots of things can increase flow, from the entirely benign to the more treatable, including hormonal changes, fibroids, endometriosis, polyps, thyroid issues, certain contraception (or coming off it), and perimenopause. The point isn't to self-diagnose from a list - it's to know that persistent heavy bleeding with clots has causes that a doctor can investigate and often treat.
When to get support
Book an appointment with your GP if you experience:
- Regular large clots or consistently very heavy periods
- Bleeding that soaks through protection every hour or two
- Periods that leave you exhausted, breathless or lightheaded (possible signs of anaemia)
- Any sudden or unexplained change in your bleeding pattern
- Bleeding between periods or after menopause
Heavy menstrual bleeding is common, taken seriously by doctors, and very manageable once the cause is understood. You don't have to just "put up with it" - support is there.
The takeaway
Occasional small clots are a normal part of many people's periods and rarely cause for concern. What matters is knowing *your* normal, so you can recognise when something changes. If your clots are large, your flow is very heavy, or something simply feels off, that's your signal to reach out - not to worry alone.
*This is general information, not medical advice. If you're concerned about your bleeding, a GP is the right person to talk it through with.*
Whatever your flow looks like, Riley's clean, organic cotton pads and tampons come in a range of absorbencies to keep you comfortable and protected. Explore the range and find the right fit for your body.
