A headache is pain anywhere in the region of the head or neck. During each year, on average, 46–53% of people have headaches. Most are not dangerous. Only approximately 1–5% of people with headaches who go to the emergency room have a serious underlying cause. 

One main cause of migraine type headaches is elevated homocysteine levels. Also, foods including dairy, wheat, eggs, sugar, and others increase the risk of headaches in many individuals. Headaches have many other possible causes, such as lack of sleep, fatigue, stress, infections, medications, etc. 

Click the Category to View Research