I went surfing this weekend at a beach along the Massachusetts coast, catching remnant swells from the storm that blew through New England last Friday. At this point in the season, water temperatures are right around the annual low (~37 degrees). I stayed warm bundled head-to-toe in thick neoprene and had a great session, but did receive several painful reminders of the one great inconvenience associated with frigid-water play: sphenopalatine ganglioneuralgia, better known as brain freeze or ice cream headache.
When the sphenopalatine nerve is stimulated by cold, it initially causes surrounding blood vessels to constrict in response. But very soon thereafter, for reasons not entirely understood, the brain reacts—over-reacts, really—to this vasoconstriction by radically dilating the blood vessels to rewarm them. This sudden pulse of blood causes the sphenopalatine nerve to register pain, which is usually manifested elsewhere in the head. (In my case, the dead center of my forehead lights up in discomfort, though it can occur in the temples or sides of the head as well.)
Most people experience brain freeze because something cold hits the roof of the mouth. In my case, I experienced it because ice-cold water hit my face when I went underwater. For a long time, I would desperately pull my neoprene hood down toward my eyes, trying to cover up the painful spot in my forehead. But now I realize that it’s being caused by the nerves in my face.
I’ve pondered various ways to prevent this, including somehow incorporating a neoprene facemask into my winter surf gear. But so far the only solution I’ve come up with is to keep my face out of the water as much as possible—which means chasing smaller surf during the coldest days of winter.
If you have suggestions for some other way to prevent cold-water brain freeze, I would love to hear them!
“Equipped” is an AMC Outdoors blog, written by Matt Heid.