Hi.
The answer to your question would depend on whether your boyfriend experiences the migraine headache during or immediately after drinking alcoholic beverages. If it occurs at a much later time, a relation would be unlikely.
However, one headache that is very common as a result of drinking alcohol is a "hangover".
In any case, you should try to talk to your boyfriend to stop, or at least minimize, his alcohol drinking because of so many other probable and definite bad health effects.
Hope this answers your query.
alcohol is a trigger to some people so yes. if he gets migraines after drinking, he should stop drinking.