It’s Groundhog Day and Punxsutawney Phil emerged from his lair to see his shadow, predicting 6 more weeks of winter. This is particularly challenging for those of you who suffer from winter migraines and headaches. The reasons why migraines can increase with changes in the weather are not clear. Some researchers suggest that changes in oxygen levels, temperature, barometric pressure, and even humidity may affect blood vessels associated with migraine occurrence in some sufferers. It is also thought that migraines...