<p>Strokes occur when blood flow to the brain is interrupted, either through a blockage in the blood vessels (ischemic stroke) or bleeding (hemorrhagic stroke). Both are medical emergencies, and both can be associated with a headache.</p>A cerebral aneurysm is a “weak spot” in an artery in the brain. This weakness allows the vessel to balloon outward and fill with blood, possibly leading to pressure on a nerve or brain tissue near the aneurysm. Aneurysms also can leak or rupture, causing blood to spill into the surrounding tissue (hemorrhage). What causes them and how do they relate to headaches?It&#39;s no secret that drinking alcohol can lead to a headache the next day, one of the signs of a hangover. But why does this happen? And how else can drinking alcohol cause a headache? Let&#39;s take a look.Smoking can cause a wide variety of health issues, and headaches seem to be one of them. Studies suggest that smokers may be twice as likely to develop headaches as non-smokers, especially in adolescence. Migraines and cluster headaches especially seem to be more frequent in smokers. In addition, smoking a higher number of cigarettes seems to cause migraines more frequently.<p>Caffeine is a subject that often comes up when talking about headaches, mainly because many sufferers are very aware that caffeine withdrawal can be a source of their headaches. How exactly does caffeine relate to headaches, and should you be using caffeine or working to cut it out of your life to avoid your headaches?</p>Concussions occur when there is a minor injury to the brain. It can temporarily interfere with the brain&#39;s normal functioning. Concussions are common in sports such as football, in which players are likely to be struck in the head.In the world of headache medicines, too much of a good thing is definitely too much. The right kinds of medications, used appropriately, can offer significant benefits for people who have chronic headaches. But taking too much of these medicines can actually backfire, resulting in pain that is more frequent and severe. This phenomenon is referred to as medication overuse headache, or MOH. Older names for it include analgesic rebound headache, drug-induced headache, medication-misuse headache and withdrawal headache.<p>Sinus headaches are definitely nothing to sneeze at. This is because the headache symptoms rarely occur alone. In addition to the pain and pressure experienced in or around the forehead, cheeks and nose, sinus headaches may be accompanied by congestion, cough, runny nose, sore throat, fatigue, fever or sneezing. Individuals suffering from a sinus headache may also notice nasal discharge that is yellow-green in color or tinged with blood.</p>