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'''Fatigue''' is extremely hard to define, since everybody has their own idea of what being tired means. Everybody is tired once in a while and the most common reason is, of course, lack of [[sleep]]. Fatigue can also be caused by a wide range of illnesses and [[disease]]s. In such cases, a person usually finds they suddenly need more rest and sleep. This may affect their performance at work. Fatigue is also common when you are feeling down.
==Sleep Requirements==
The need for sleep can vary quite a lot between individuals, although it is usual to require less sleep as you get older.
* Children
:Small children often need a lot of sleep. Toddlers, for example, may need between 18 and 20 hours a day. The need for sleep slowly declines through childhood. Most grade school children will need at least 10 to 12 hours of sleep to be at their best during the [[day]]. It does not help children if they are allowed to stay up late and are then hauled out of bed the next morning.
*Adults
:Most adults need seven to nine hours of sleep, but this can differ from one person to another different person. A good night's sleep seems to help concentration and improve the [[immune system]], minimizing the risk of illness.
==Causes of Fatigue==
There are a number of conditions that cause fatigue.
* [[Anemia]] - a lack of [[iron]] is most often seen in [[women]] who have prolonged or heavy [[period]]s. [[Blood]] is lost every month, which means more iron is needed in the diet.
* [[Pregnancy]]
* General bleeding from the [[stomach]] or [[intestine]]s, as caused by [[ulcer]]s, [[hemorrhoid]]s [[polyp]]s, violence, or [[piles]]
* A lack of folic acid or [[vitamin]] B12.
* Small intestinal [[disease]]s or syndromes, such as Crohn's disease.
* Infections
* Glandular fever
* [[Lyme disease]]
* [[AIDS]]
* Lack of [[sleep]]
* [[Depression]]
==Sleep Requirements==
The need for sleep can vary quite a lot between individuals, although it is usual to require less sleep as you get older.
* Children
:Small children often need a lot of sleep. Toddlers, for example, may need between 18 and 20 hours a day. The need for sleep slowly declines through childhood. Most grade school children will need at least 10 to 12 hours of sleep to be at their best during the [[day]]. It does not help children if they are allowed to stay up late and are then hauled out of bed the next morning.
*Adults
:Most adults need seven to nine hours of sleep, but this can differ from one person to another different person. A good night's sleep seems to help concentration and improve the [[immune system]], minimizing the risk of illness.
==Causes of Fatigue==
There are a number of conditions that cause fatigue.
* [[Anemia]] - a lack of [[iron]] is most often seen in [[women]] who have prolonged or heavy [[period]]s. [[Blood]] is lost every month, which means more iron is needed in the diet.
* [[Pregnancy]]
* General bleeding from the [[stomach]] or [[intestine]]s, as caused by [[ulcer]]s, [[hemorrhoid]]s [[polyp]]s, violence, or [[piles]]
* A lack of folic acid or [[vitamin]] B12.
* Small intestinal [[disease]]s or syndromes, such as Crohn's disease.
* Infections
* Glandular fever
* [[Lyme disease]]
* [[AIDS]]
* Lack of [[sleep]]
* [[Depression]]