When something very cold touches the roof of your mouth on a hot day, it triggers a headache and this is called the ice cream headache.

It is because of the dilation of the blood vessels in the head and this may be caused by the nerves above the roof of your mouth when they become cold.

It is also called brain freeze and to avoid this, keep very cold food or beverages away from the roof of your mouth.

Fortunately, this ice cream headache lasts only for thirty seconds.