A sudden and abrupt rise in adrenaline can place some strain on your brain, not in a particularly harmful way, but this surge of energising adrenaline can result in significant brain pain…it can give you a headache! So in the same sense that not warming up fails to prepare the muscle for exercise, often resulting in muscle strains and tears, the failure to adequately warm up can also give rise to head aches! Spending 5-10mins performing light rowing or jogging (for example) alongside light stretching and dynamic movements can significantly reduce your chances of suffering.
Men’s Health, (2014). 10 crazy reasons you have a headache. Retrieved 24th September, 2014, from http://www.menshealth.com/health/10-crazy-reasons-you-have-headache?cid=socHE_20140924_32181776