The most common types of headaches are tension and migraine headaches. Tension headaches strike when the muscles in the head and neck tighten. Migraines come on when supersensitive nerve endings in the brain create pain. But what makes the muscles tense, or causes some nerve endings in the brain to become so sensitive? That's not as well understood...

When debating how to prevent headaches, the easy answer is to try to avoid the causes of headaches in the first place. But doing that takes careful planning. You'll have to note your triggers first, and write down the characteristics of your headaches, including their frequency, duration, intensity, as well the circumstances surrounding your headac...