Can HRT trigger migraines?

Hormone replacement therapy (HRT) can potentially trigger or worsen migraines in some people. This seems to occur more often in those with a history of migraine headaches, especially migraine with aura.
The exact mechanism behind how HRT may trigger migraines is not fully understood. Some theories include:

Who is most at risk:

Strategies to reduce migraine trigger from HRT:

If you develop migraines on HRT:

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