Why Does Weed Give Me Migraines?

Limonene is the most commonly overlooked migraine trigger in cannabis. It is the dominant terpene in many sativa-dominant strains and is associated with cerebral activation and vasodilation that can trigger migraines in susceptible individuals. If you have always used sativa-dominant strains, switching to an indica-dominant strain with beta-caryophyllene and myrcene on the COA terpene panel frequently resolves the issue entirely. High THC doses are the second most common cause: too much THC triggers anxiety and cerebral vasodilation, both of which can initiate a migraine. Starting at 2.5mg and adjusting slowly rather than using high-potency products produces better migraine outcomes for sensitive individuals.

Smoking rather than vaping is another common and easily fixed cause. Combustion produces carbon monoxide and respiratory irritants that directly worsen headaches independent of the cannabis itself. Switching from a joint or pipe to a vaporizer at the same dose frequently eliminates cannabis-related headaches. Dehydration compounds all of these factors: THC can reduce saliva production and increase the temptation to skip water, and dehydration alone is a significant migraine trigger. Drinking at least a full glass of water before and after cannabis use, particularly with inhalation, is a simple but meaningful variable.