Headaches are a disorder of the nervous system. Even though the exact causes of a headache are not clear most of them are caused by the widening of blood vessels combined with chemicals that are set free around them. Nerves send pain messages to your brain.

 There are many factors that can lead to a headache. Here are some of them:

• not enough sleep
• not enough water
• stress
• watching TV or looking at a computer screen for a long time
• smoking
• alcohol
• coffee, tea and certain foods