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Nausea

Medical Cannabis and Nausea

Nausea is the unpleasant queasy feeling in your stomach and the back of your throat when you feel like you may vomit. Simply put, it’s the medical term for feeling sick. When nausea is caused by a sickness bug or food poisoning, it’ll pass on its own within a few days. 

Nausea is the unpleasant queasy feeling in your stomach and the back of your throat when you feel like you may vomit. Simply put, it’s the medical term for feeling sick. When nausea is caused by a sickness bug or food poisoning, it’ll pass on its own within a few days. 

However, when it’s caused by chemotherapy treatment or a serious, long-term condition such as migraines, PTSD, or Crohn’s disease, it can become a debilitating symptom that patients have to deal with over and over again. 

Studies have shown that medical cannabis may help some patients manage nausea thanks to the way THC interacts with the endocannabinoid system. It’s believed that THC may activate receptors in the brain that help to ease or, in some cases, essentially ‘switch off’ feelings of nausea. More research is needed, but preliminary evidence suggests that CBD may also have anti-sickness properties. 

Nausea is an incredibly common side-effect of cancer treatments, including chemotherapy. Certain studies have therefore highlighted the potential benefits of medical cannabis for those undergoing chemotherapy, with some patients finding that it offers a helpful way to manage nausea.

A significant benefit of medical cannabis in managing nausea is how fast it acts. When it’s inhaled or taken sublingually (below the tongue) it can act in minutes, meaning it could potentially provide quick relief to some patients. 

If you want to learn more and find out whether you may be eligible for medical cannabis, our medical cannabis eligibility checker is fast and free. 

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FAQs

Stop the cannabis stigma with these useful FAQs. Have a question, reach out to us.
  1. Yes, patients legally prescribed medical cannabis in the UK can drive, provided that they:

    • Are not impaired in any way
    • Can prove that the cannabis medication has been legally prescribed
    • Are taking their prescribed cannabis medication as directed by your specialist consultant 

    The Cannabis Industry Council (CIC) states that as long as the above criteria are met, legally prescribed medical cannabis patients have a legal defence, even if they have over 2μg/L of THC in their blood and are subsequently arrested/charged.
    That said, it is the patient’s responsibility to judge whether they are fit to drive before getting behind the wheel.
    If you like to learn more, head to our medical cannabis and driving guide.

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Learn more about nausea and medical cannabis

What causes ongoing nausea?

There are a number of possible causes behind nausea that persists or keeps coming back. For example, gastrointestinal conditions such as irritable bowel syndrome, Crohn’s disease and coeliac disease could be to blame; patients will probably feel sick every time they have a flare-up. What’s more, individuals who suffer from recurrent and persistent migraines or cluster headaches will often also experience nausea as a repeated symptom. Psychological conditions such as anxiety and PTSD can also sometimes be responsible for recurring feelings of nausea. Ongoing nausea could be a sign of early pregnancy, and it’s one of the most common side effects of chemotherapy treatment. 

If nausea is severe, comes on suddenly or is accompanied by shortness of breath, chest pains, or pain in the arms, back, neck or jaw, please seek urgent medical attention. 

Can medical cannabis help with nausea?

Promising research suggests that medical cannabis could help reduce nausea in some individuals with a wide range of conditions, from mental health issues to gastrointestinal diseases. This is mostly due to the THC content, which might interact with the endocannabinoid system in a way that could effectively reduce or ‘switch off’ feelings of nausea. While more research is needed into CBD and nausea, some studies indicate that it may also have anti-sickness properties that could work alongside THC to potentially provide meaningful relief to some patients. 

Nausea during cancer treatment

Nausea is one of the most commonly cited side effects of cancer treatment, including chemotherapy. Chemotherapy-induced sickness is a very common symptom for those undergoing treatment, and it can make a worrying time feel even more difficult. 

Some people experience nausea a few minutes after starting treatment, while others start feeling nauseous hours after treatment. Post-treatment nausea usually lasts around two to five days, but in severe cases it can last up to a week. Some patients also experience ‘anticipatory nausea’ before starting a new cycle of chemotherapy. This is a learnt physical response to anticipation which usually happens if nausea wasn’t sufficiently managed during a previous cycle. 

Anti-sickness medication, sometimes referred to as anti-emetics, is often administered by a healthcare professional before treatment to prevent and reduce nausea where possible. 

Studies have highlighted the potential positive benefits of medical cannabis in managing chemotherapy-induced nausea, making it a possible option for patients suffering from sickness. Certain animal studies also indicate that medical cannabis could possibly be a way for certain patients to relieve their anticipatory nausea, which can sometimes be difficult to manage.

If you want to know more about medical cannabis and managing cancer treatment side effects, we’re here to support and inform you. 

Nausea with migraine and headaches

Anyone who suffers from migraines knows that the symptoms go far beyond the intense pain in their head. Often, migraines bring with them a host of other debilitating symptoms, including nausea and vomiting. 

However, this isn’t only a symptom of migraines; sometimes bad headaches can also cause nausea. Headaches accompanied by nausea could be triggered by dehydration, alcohol, caffeine withdrawal or premenstrual hormones.  

The nausea that comes along with migraines and headaches is often treatable with fluids, rest and over-the-counter painkillers such as ibuprofen and paracetamol. However, those who experience frequent or debilitating migraines or headaches may want to explore other options that could help them manage symptoms, including medical cannabis. 

Certain studies have suggested that medical cannabis could help reduce nausea and vomiting in some migraine patients, as well as being a potential way to reduce the pain of migraines themselves. 

Cannabis hyperemesis syndrome 

When talking about medical cannabis and nausea, it’s important to address cannabis hyperemesis syndrome. This is a rare condition that sometimes occurs in people who have taken medical cannabis for a very long time or in excessive amounts. 

Cannabis hyperemesis syndrome causes bouts of nausea, stomach pain, vomiting and dehydration. The exact cause of this syndrome is still unclear, but certain studies suggest it may be due to overstimulation of the endocannabinoid system. That’s to say, it’s possible that long-term medical cannabis consumption disrupts the pathways that control nausea and vomiting.

Individuals who experience this condition have usually taken medical cannabis for around 9-10 years, on average, and it’s more likely to occur in patients who consume medical cannabis on a very regular basis and people who have been self-medicating with cannabis since they were teenagers. However, not everyone who uses cannabis will develop cannabis hyperemesis syndrome. 

We would never prescribe medical cannabis to anyone under 18 and we urge all patients to not exceed the dose your prescribing clinician has set. 

When to speak to your doctor

While nausea usually isn’t anything to panic about, it’s important that you seek medical attention or advice if you experience nausea with severe pain, blood in your vomit, inability to keep fluids down, an unusual headache, confusion, fever with neck stiffness or unintended weight loss. 

"Since starting my treatment plan with Releaf, I’m genuinely shocked at how well it has worked."
Chloe Durrington, Releaf patient

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