Can CBD oil cause headaches?
It's unlikely. Headaches aren't a commonly reported side effect of CBD, and there's no strong scientific evidence linking them. A 2022 systematic review of clinical trials found headaches occurred at similar rates in CBD and placebo groups — suggesting they're not directly caused by CBD itself. If you do get a headache after taking CBD, it's more likely down to product quality, dosage, or just how your body responds.
We all turn to CBD in search of calm. Whether it's to ease the tension of a busy day or support your overall wellbeing, you expect it to help you feel better — not worse. So, if you've experienced a headache after taking CBD, you might be wondering: was the CBD to blame?
Let's break it down together. While most people tolerate CBD very well, a small number of users have reported headaches — though the cause may not be as simple as it seems.
Is there a link between CBD and headaches?
In short: there's no strong scientific evidence that CBD oil directly causes headaches. The World Health Organization's 2018 Critical Review found that "CBD is generally well tolerated with a good safety profile," with most reported adverse effects linked to drug interactions rather than CBD itself. A peer-reviewed analysis of 132 studies published in Cannabis and Cannabinoid Research confirmed that the most commonly reported side effects include drowsiness, dry mouth, fatigue, and digestive upset — not headaches.
So, while it's not a common issue, it's not entirely off the table either.
Why CBD might trigger headaches in some people?
Every body is different — and so is every bottle of CBD. Here are some potential reasons a headache might appear after taking CBD:
1. Poor product quality
Not all CBD is created equal. Cheaper products often use lower-quality extraction methods, which can leave behind solvents, pesticides, or other unwanted residues. These contaminants, not the CBD itself, could be the real culprit behind a headache. As Harvard Health notes, "you cannot be sure that the product you buy has active ingredients at the dose listed on the label" — which is why independent testing matters.
That's why we use cold-pressed CBD and supercritical CO2 extraction. These methods cost more, but they avoid the issues that cheaper solvent-based approaches can have.
2. Taking too much too soon
If you're new to CBD, starting with a high dose can overwhelm your system. Some people find that diving in too fast results in temporary side effects like dizziness or headache.
The solution? Start low, go slow. For most people, a small amount is enough to feel the benefits. You can always work your way up gradually. (Need help figuring out your dose? Our CBD Dosage Calculator walks you through it.)
3. Your personal biochemistry
We all metabolise CBD differently. Things like hydration levels, sleep, hormones, and diet can all affect how you respond. For some, a headache might simply be your body saying "not today" — or "try a little less next time."
What to do if you get a headache after CBD?
If you suspect your CBD oil is causing headaches, here's what we suggest:
- Take a short break and see if the headache stops.
- Check the source: Is your CBD third-party tested and made from quality hemp?
- Reduce your dose and see how you feel.
- Stay hydrated, especially if you're new to CBD.
- Speak with your GP if the headaches continue, or if you're taking any other medications.
If it happens once, it could be coincidence, dehydration, or just a bad day. But if you're getting headaches more than a few times after using CBD, it's probably not a great fit for your body. Whatever the reason, it's not worth the headache — just stop and try something else.
How long do CBD side effects last?
If side effects happen, they typically show up in the first couple of weeks and fade as your body adjusts. With oral CBD oil, effects usually last 4–6 hours. Either way, most mild reactions are short-lived.
The takeaway
CBD is generally well-tolerated, and for most people a one-off headache isn't a sign of anything serious. It might just mean you need a lower dose, a better quality product, or a bit more time to adjust.
If it's helping, stick with it. If it's not, stop — there's no point pushing through something that isn't working for you. You know your body better than anyone else.
FAQs
Can CBD oil cause headaches?
It’s rare, but possible. Some people may experience a headache due to dosage, product quality, or individual response.
Is headache a listed side effect of CBD?
No, headaches are not among the commonly documented side effects in clinical studies.
What are the most common side effects of CBD oil?
Drowsiness, dry mouth, fatigue, diarrhoea, and reduced appetite are the most reported.
How can I avoid headaches from CBD?
Start with a low dose, use high-quality products, stay hydrated, and monitor your body’s response.
Should I stop taking CBD if I get a headache?
Not necessarily-but it’s a good idea to pause and reassess. If the headaches persist, talk to your healthcare provider.
