Migraine lasts from a few hours to 2-3 days. Migraines are usually one sided, but may switch sides. Clusters are one sided. Migraine usually throbs with every heart beat. Migraines are also accompanied in many cases by nausea vomiting, coldness, runny nose, teeth grinding and neck tenderness.
Tension headaches is triggered by psychological and physical stress.
But although one-third of people get them, not much is known about them. The general belief is that the sudden change in temperature causes an over stimulation of the central nervous system. Although they can occur any time of year, ice-cream headaches are more apt to strike during very hot weather or when a person is overheated. That, and the fact that more ice cream is consumed in hot weather, makes summer the height of ice-cream headache season. That's because migraine sufferers are sensitive to environmental stimuli such as light, sound and temperature.