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Are there any known side effects of using cannabis for fibromyalgia? 

Posted
Updated
ByMy Patient Advice
Author: Julia Sutton, MSc | Reviewed by: Dr. Clarissa Morton, PharmD

While cannabis offers potential relief for many fibromyalgia  sufferers, it is not without risks. Understanding the possible cannabis side effects can help patients make informed choices and minimise discomfort. These effects vary depending on the strain, dosage, and individual sensitivity. 

Some people experience improved sleep, reduced pain, and better mood but others may notice negative effects like fatigue, dizziness, or anxiety. These reactions often result from improper dosing or unsuitable strain choices, and being aware of them can prevent worsening symptoms or poor treatment outcomes. 

Am I Eligible for Medical Cannabis?

Common cannabis side effects in fibromyalgia users 

Here are some of the cannabis side effects reported by fibromyalgia patients, along with possible triggers: 

Drowsiness or Fatigue 

Some strains, particularly those high in THC, may cause excessive sedation, making daytime use difficult. 

Dry Mouth and Eyes 

Cannabis can reduce saliva and tear production, which may cause discomfort, especially during prolonged use. 

Anxiety or Paranoia 

High-THC strains or improper dosing may lead to heightened nervousness or racing thoughts, a notable symptom reaction in sensitive users. 

Dizziness or Low Blood Pressure 

Cannabis can cause drops in blood pressure, leading to light-headedness, especially when standing up quickly. 

Cognitive Fog 

In some cases, patients experience short-term memory lapses or reduced focus, which may be problematic during daily tasks. 

Monitoring your body’s symptom reaction and adjusting your routine is key to avoiding negative effects. Always begin with a low dose, record your responses, and speak with a healthcare provider experienced in cannabinoid therapies to tailor your approach effectively and safely. 

If you’re exploring cannabis treatment options for fibromyalgia, visit providers like LeafEase for personalised consultations and guidance tailored to your needs. 

For a deeper dive into the science, diagnosis, and full treatment landscape, read our complete guide to Medical Cannabis and Fibromyalgia . 

Julia Sutton, MSc
Author

Julia Sutton is a clinical psychologist with a Master’s in Clinical Psychology and experience providing psychological assessment and therapy to adolescents and adults. Skilled in CBT, client-centered therapy, and evidence-based interventions, she has worked with conditions including depression, anxiety, bipolar disorder, and conversion disorder. She also has experience in child psychology, conducting psycho-educational evaluations and developing tailored treatment plans to improve learning and well-being.

All qualifications and professional experience stated above are authentic and verified by our editorial team. However, pseudonym and image likeness are used to protect the author's privacy. 

Dr. Clarissa Morton, PharmD
Reviewer

Dr. Clarissa Morton is a licensed pharmacist with a Doctor of Pharmacy degree and experience across hospital, community, and industrial pharmacy. She has worked in emergency, outpatient, and inpatient pharmacy settings, providing patient counseling, dispensing medications, and ensuring regulatory compliance. Alongside her pharmacy expertise, she has worked as a Support Plan & Risk Assessment (SPRA) officer and in medical coding, applying knowledge of medical terminology, EMIS, and SystmOne software to deliver accurate, compliant healthcare documentation. Her skills span medication safety, regulatory standards, healthcare data management, and statistical reporting.

All qualifications and professional experience stated above are authentic and verified by our editorial team. However, pseudonym and image likeness are used to protect the reviewers's privacy. 

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