The short answer
Health Canada says cannabis can lower blood pressure when changing from sitting or lying to standing, which may cause dizziness, blurred vision, light-headedness or fainting. THC can also affect coordination. These effects may increase falls and injuries, especially with alcohol or other health products. Dizziness can have other causes; this page cannot identify yours.
A practical checklist
If you discuss dizziness with a health professional, note when it began, whether it followed a change in position, recent cannabis product/route/timing, alcohol, medicines or other health products, and whether there was a fall. Health Canada lists loss of consciousness, chest pain, shortness of breath, weakness/numbness and confusion or speech difficulty among serious effects after cannabis; seek urgent medical help for severe symptoms. For broader age-related context, see Health Canada's older-adult cannabis overview.
Questions readers ask
Can cannabis be the only reason for dizziness?
Not necessarily. Health Canada describes possible cannabis effects; dizziness can have other causes and this page cannot identify yours.
Why mention standing up?
Health Canada says cannabis may lower blood pressure when changing position, which can cause dizziness or faintness and increase fall risk.
Sources
- Health Canada: Adults over 55
- Public Health Agency of Canada: Using substances as an older adult
- Health Canada: Information on the use of cannabis for medical purposes (January 2026)
Sources checked September 24, 2026.