You probably know the drill. A cramping first day of your period, a dose of ibuprofen, and you get on with your day. For many women on the pill, that routine comes with a nagging worry about blood clots.
A large new European study, published in The Lancet Obstetrics, Gynaecology, & Women's Health, suggests the painkiller itself is probably not the driver. The underlying health problems women take it for appear to carry much of the blame.
Where the worry about painkillers and the pill came from
The concern took hold after a 2023 Danish study in the BMJ. Researchers tracked about 2 million women aged 15 to 49 over two decades and found more blood clots in those who took NSAIDs alongside hormonal contraception.
Ibuprofen was by far the most common NSAID in that study. The combined risk looked largest when the painkiller was paired with higher-dose hormonal contraception.
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Since then, many clinicians have nudged patients toward other options for menstrual pain, or asked extra questions about painkiller habits when writing a pill prescription.
How the new study tested the link
The latest work covered more than 3 million women using hormonal contraception. The data came from national registries in Denmark and Norway, and from electronic health records in Spain and the United Kingdom, over the decade ending in 2024.
Instead of comparing women on painkillers with women not on them, the researchers used each woman as her own comparison. They looked at her clot risk in the weeks before, during and after an NSAID prescription.
The pattern pointed away from the painkiller. Clot risk was already climbing in the two weeks before women filled an NSAID prescription.
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The risk peaked around the start of treatment, stayed elevated during use, then fell once women stopped.
As a cross-check, the team also looked at acetaminophen, a painkiller not known to raise clot risk. The same curve showed up. That strongly suggests the real culprit is whatever health problem sent women to the painkiller, not the painkiller itself.
What this changes for women on the pill
Many women reach for ibuprofen for painful periods, headaches or muscle aches. If the new findings hold up, short-term use alongside the pill is probably not the clot driver earlier reports suggested.
The authors still urge caution for women with other clot risk factors. These include a personal or family history of clots, inherited clotting disorders, obesity, smoking and recent surgery.
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Rather than discouraging short-term NSAID use, they recommend focusing on identifying and managing those existing risks.
The study is observational, which means it can show patterns but not fully prove cause and effect. The researchers also note they cannot rule out a direct NSAID effect, since the number of clots in their dataset was small.
If you take hormonal contraception, watch for symptoms like leg swelling, chest pain, sudden shortness of breath or a severe one-sided headache. Those are red flags for a clot and should be checked by a doctor the same day.
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This article is made and published by Mie Hermansen, who may have used AI in the preparation.