There are days you can see coming on the calendar weeks in advance, not because something fun is planned, but because your body is about to remind you of itself. The cramp that starts as a dull pressure low in your abdomen, and slowly turns into something that breaks your concentration, undermines your plans, and sometimes simply forces you to do absolutely nothing for a while. The tiredness that doesn't go away with sleep, no matter how early you go to bed. For many women this is just a fixed part of the month, something you resign yourself to and build a routine around: the hot water bottle, the ibuprofen within reach, the day you'd rather not schedule any appointments.
More and more people are therefore looking at CBD as something to place alongside that familiar routine. Not as a replacement for what already works, but as something extra, something to try on the days when the usual approach doesn't seem to be enough. The question that comes up is a logical one: is anything known about this yet, or are you mostly chasing marketing? What can we honestly say about it, and what do we not know yet?
What actually happens with period pain
Period pain, called dysmenorrhea in the medical world, occurs because the uterus contracts to shed its lining. Those contractions are driven by substances called prostaglandins, the same family of inflammation-promoting compounds that also play a role in fever and swelling elsewhere in the body. The higher the prostaglandin level in the uterine lining, the stronger the contractions, and so the more intense the cramp usually feels. This also immediately explains why common painkillers such as ibuprofen work: they block exactly this prostaglandin production.
There is a distinction between primary dysmenorrhea, period pain without an underlying cause, and secondary dysmenorrhea, where something else is involved, such as endometriosis or fibroids in the uterus. In practice these two often overlap, and it isn't always easy for someone to recognize the difference themselves. Many people also experience PMS symptoms in the same cycle: mood swings, bloating, irritability, and a tiredness that sometimes starts days before the period itself. For some, the pain during the period is the biggest problem, for others it's the pile-up of all these smaller discomforts that makes the week heavy.
What the research on CBD shows
This is still a relatively new area of research, which is surprising when you consider how widespread period pain is and how long people have been experimenting with cannabis for all kinds of complaints. It is therefore important to be precise about what has been shown, what is still being investigated, and where exactly the line between those two lies.
A randomized, open-label study from 2024, published in Experimental and Clinical Psychopharmacology by researchers from the University of Arkansas and Auburn University, looked specifically at CBD and menstrual-related symptoms. According to the authors themselves, no study had previously examined the effect of cannabinoids on these symptoms. It involved 33 participants with moderate to severe symptoms, who were randomly assigned to two dosing groups: 160 mg or 320 mg of CBD, twice a day. Each month they started on the first day their symptoms appeared, and took the softgels for five days, for three months, after a baseline measurement that served as a point of comparison. The researchers saw a decrease in menstrual-related symptoms, irritability, anxiety and stress compared with that baseline measurement.
It's important to mention that this was an open-label study, which means participants knew they were receiving CBD, and there was no placebo group to compare the results against. The group was also small, with an average age of around twenty, and symptoms were self-reported through questionnaires. The study also looked at menstrual-related symptoms in a broad sense, both physical and psychological, so not only the cramp itself. And the extent to which participants' expectations played a role was not directly measured in the study. That makes it an interesting first signal, something worth investigating further, but not conclusive proof that the effect can be attributed to the CBD itself.
In addition, a Phase II study has been set up, the protocol of which was published in 2022 in Principles and Practice of Clinical Research, comparing CBD as a stand-alone product, so not mixed with other substances, with ibuprofen for period pain. According to the protocol, there had been no earlier trials testing CBD alone for this complaint. This study is randomized and triple-blinded, which means that neither the participants, nor the research team, nor the people analyzing the data know who receives which product, a considerably stronger study design than the one above. Participants take the products over several menstrual cycles, so the effect doesn't depend on chance in a single cycle.
As far as we could find, this study has only been published as a protocol, the description of how the study is set up, which measurements are taken and how the data will later be analyzed. We did not find any results. In other words: we know this question is being investigated seriously and carefully, with exactly the kind of study design that could deliver convincing evidence, but we don't yet know what comes out of it.
What this means for you
Based on what is currently known, we can't say that CBD is proven to work against period pain the way ibuprofen does, with decades of research behind it. What we can say is that serious scientific research is underway, with first, cautiously positive signals from the open-label study, and a more thoroughly designed trial that still has to show what the answer actually is. That is exactly the honest, interim state of affairs: interesting enough to investigate further, not enough yet to make firm promises. In the research done so far, CBD is also generally well tolerated, which in itself says something about how safe it is to experiment with.
Many people who use CBD around their period do so alongside their usual pain relief, not instead of it. Some mainly notice a difference in the days before, with PMS symptoms such as irritability and restlessness, others during the cramp itself. That differs from person to person, and that is exactly why trying it out, calmly and with realistic expectations, in consultation with yourself and if needed your GP, is at the moment the only way to find out whether it adds something for you.
Important: this article is meant as information, not as medical advice. CBD is not a replacement for existing treatment of period complaints. Persistent or severe period pain can point to an underlying condition such as endometriosis; discuss this with your GP.
Sources
- Examination of the Effects of Cannabidiol on Menstrual-Related Symptoms (2024). Experimental and Clinical Psychopharmacology. Randomized, open-label study with 33 participants on CBD softgels (160 mg or 320 mg, twice daily) for menstrual-related symptoms. researchgate.net/publication/377110401. Trial registration: clinicaltrials.gov/study/NCT05679830
- Efficacy of Cannabidiol Versus Ibuprofen in the Relief of Menstrual Pain in Females Living with Primary Dysmenorrhea: A phase II, Non-Inferiority trial (2022). Principles and Practice of Clinical Research. Published study protocol; no results found. journal.ppcr.org/index.php/ppcrjournal/article/view/216
