Alcohol is a diuretic, which means that it increases urination and in doing so increases your risk of becoming dehydrated. Dehydration, especially when coupled with the loss of electrolytes that happens while drinking, can lead to severe headaches. Headaches will often develop during alcohol withdrawal as a result of neurochemical changes.
They’re also triggered by many things, including certain kinds of foods, exertion, cigarettes, and alcohol. For example, your genetic makeup may be such that you just can’t tolerate a lot of alcohol, or you may have a naturally-low body weight. That also doesn’t allow for much alcohol in general, beer or otherwise. If you’ve ever had just one beer and got a headache not long after, you’re seeing the principles in the list above in action.
