Brain freeze is a short, sharp headache that occurs when something very cold touches the roof of the mouth, causing rapid constriction and dilation of blood vessels and activation of the trigeminal nerve. This reaction produces a brief, intense pain in the forehead or temples that typically lasts only a few seconds. Because brain freeze involves the same nerve pathways linked to migraine pain, some people have explored it as a way to interrupt or reduce the severity of a migraine attack. The sudden cold may momentarily alter blood flow or disrupt pain signaling in the brain. While research is still limited, it is a simple, low-risk approach that some find helpful at the early stages of a migraine.