Headaches that arise due to abnormalities in your vascular system (arteries) are more commonly known as “migraines.” Although many Americans experience at least one migraine over the course of their lives, the cause of migraines varies from patient to patient. Medical studies show that migraines can be triggered by a change in hormones arising from exposure to food, smells, changes in the weather, and even emotional stress. When these changes in your body’s hormone levels occur, the blood vessels located in your head dilate. This causes other symptoms like nausea, sensitivity to light and sound, and visual auras, followed by a severe headache that cannot be treated effectively or even disguised by aspirin and other over-the-counter medications.