There are many different things that can cause headaches: Abrupt changes in your diet or an everyday schedule like getting too much or too little sleep, stress, long working hours, or skipping a meal, a hangover from drinking, from watching TV in a dark room or from using the computer for a long time without taking breaks. But having said that, what many people don't realise is that most often a common headache is a symptom of dehydration. Next to oxygen, water is most necessary for survival. We can go without food for almost two months, but without water only a few days. Most people have no idea how much water they should drink. In fact, many live in a dehydrated state. Water is the key to life on this planet and to your body. Just as earth is 70 per cent water and 30 per cent land, the human body is a miniature version of it. Dehydration is the loss of water and electrolytes, such as sodium, chloride and potassium, which are necessary for the body to function and be healthy. The main cause of dehydration is not drinking enough water to maintain healthy levels. Headaches aren't unhealthy by themselves, headaches are a sign that tell us that something is wrong, however our body does not always give straight and clear signals that tell us how to behave. When our body is dehydrating, we don't always feel thirsty, and most often headaches is your body telling you to hydrate. Most adults require anywhere between two to five litres a day depending on their height and weight and depending on the type of lifestyle they have. It is important to keep sipping on water through the day, depending on your lifestyle you made need to increase or decrease water intake, however a minimum of eight glasses a day is recommended for normal adults. Specially if you have a headache, try and consciously drink water till the pain subsides. Try it... It works like a magic potion. If the headache persists despite hydrating enough, it is important to pay necessary attention and get to the bottom of it at the earliest.