Dehydration is another common cause of headaches—in fact, the head pain during a hangover is mostly due to this factor. Often, this kind of headache causes a pulsing sensation in the temples. To prevent them, aim to drink water regularly throughout the day.
Don't wait until you are thirsty; the body is already dehydrated at this point. Most people should drink around two liters of water a day. Increase this if it's hot outside or you've been exercising. In many cases, headaches caused by dehydration will start to go away once you've corrected this imbalance in your body.

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