What causes a headache and what actually occurs when you have a headache?
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1. Headaches have a wide variety of causes, ranging from eyestrain to inflammation of the sinus cavities to life-threatening conditions such as encephalitis, brain cancer, and cerebral aneurysms. When the headache occurs in conjunction with a head injury the cause is usually quite evident; however, many causes of headaches are more elusive.the most common type of headache is a tension headache. Some people experience headaches when they are hungry or dehydrated
