Most people have experienced a headache at one time or another. They can range in severity from annoying to debilitating.
Sitting at a computer all day, holding your neck in the same tight position can cause tension headaches. At the other end of the spectrum, migraines can cause severe pain, nausea, vomiting and sensitivity to light and sound.
Headaches can be a sign you need a break or that your blood sugar is low. This article in Time Magazine has a list of 21 natural ways to prevent and treat headaches, including eating small, frequent meals; icing your forehead and taking breaks away from your computer.