Why Do I Have Period Blood Clots?

If your period is feeling a little less cranberry juice, and a little more cranberry jam then you might be experiencing the unique phenomenon that is the period clot. These jelly-like lumps might come as a bit of a surprise the first time you experience them – but they’re actually an extremely common part of having a period. So before you jump to conclusions about these intriguing little lumps – here’s the lowdown on what they are and why you might have them…

Why do blood clots during menstruation occur?

‘Clot’ might not be the most pleasant sounding word (or the most pleasant sight) but these little lumps are actually harmless. When you have your period, your body releases anti-coagulants that stop menstrual blood from clotting and allow it to flow freely through the cervix and out of the body. If you happen to experience a heavy flow, these anticoagulants might not have enough time to work, leading to the appearance of clots. They might appear a little darker than your menstrual flow usually is, but rest assured, they are just your period in a more solid form.

Are these clots normal?

Around 30% of women will experience heavy menstrual bleeding at some point in their lives, and clotting is a common byproduct of this. Having a heavy period is just a fact of life for some some women, and experiencing a little clotting from time to time is completely normal. However, if you are concerned by your flow, regularly see clots that are larger than your thumbnail, or notice a change or increase of clots, make sure to speak with your doctor. A lot of women accept heavy, ‘clotty’ periods as a part of life, but they can often be a symptom of an underlying health issue – and in many cases can be easily treated.

Common causes of blood clots

Other than a heavy flow, here are a few other common causes of periods clots:

Uterine Fibroids

These benign growths are usually painless, forming in the uterus and can often go completely undetected. Fibroids can cause increased menstrual flow, leading to clots.

Thyroid Abnormalities

This tiny gland in your neck has a lot to do with hormone regulation, and up to ¾ women with thyroid issues experience heavy menstrual bleeding and consequently, period blood clots.

Hormonal Changes

Your sexual hormones (estrogen, progesterone etc.) are responsible for both the creation and destruction of your uterine lining. If your hormones are irregular, then you might experience an extra thick uterine lining, and consequently, clotting.


These conditions are characterized by uterine lining growing outside of its normal place (adenomyosis occurs within the muscle wall of the uterus, while endometriosis can occur anywhere in the body). Both can cause very heavy, painful periods and clotting is a common symptom.


If there’s a chance you might be pregnant, then sudden heavy bleeding or clotting could be a sign of miscarriage. Make sure to talk to your doctor if you have any concerns about this.


Heavy flow and blood clots are often one of the signs of perimenopause or menopause.


Some medications, especially certain steroids, have a side effect of heavy flow and period clots, so make sure to consult with your doctor if you think your medication could be causing clots.

How to manage blood clots

Harmless though they are, blood clots can be tricky to manage. If you are a pad user, you might find that your pad can’t absorb your clots and they sit on top of the pad. This might also be the case if you’re a tampon user, with clots collecting above your tampon. Clots are much more easily managed with menstrual cups that collect blood as opposed to absorbing it.

Why menstrual cups are perfect for period clots

Menstrual cups are inserted into the vagina to collect your flow, unlike tampons and pads which are absorbent and can cause dryness and irritation. Cups are great for heavy flow and some, like the classic Lily Cup, have a higher capacity than even a super tampon. They can be worn for up to 12 hours, and are completely reusable, so you just rinse and reinsert.

Menstrual cups will let your clots pass, with minimal disruption to your natural flow, and you can even examine the color and consistency of your clots to help monitor any changes.

The first time you experience clots can be a little unnerving, but rest assured that they are very common and usually completely harmless. Hopefully you now know everything you ever wanted to know about period clots (plus some facts that you maybe could’ve done without). If you’re worried about the size or frequency of these little lumps, be sure to talk to your doctor. Otherwise, take these tiny blobs for what they are – just another period peculiarity.

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Please note that advice offered by Intimina may not be relevant to your individual case. For specific concerns regarding your health, always consult your physician or other licensed medical practitioners.

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