Are you extremely tired all of the time? Does this tiredness not go away, even after you have had your rest and sleep? Do you feel that the state of your body limits the way you work towards your ordinary day activities? Well, you may be suffering from chronic fatigue syndrome, which is quite dangerous and needs a complete check up. In simple words, this is a disorder, which causes extreme fatigue in a person. It tends to last for a prolonged period, usually more than six months. There are other names to refer to this particular syndrome, which includes chronic fatigue immune dysfunction syndrome (CFIDS), post-viral fatigue syndrome (PVFS) and several other terms. You cannot know, through medical tests or X-rays, if you are suffering from this particular disorder. You need to go to the doctor, who will inform you after a complete and thorough examination. Although you may think that fatigue is common, but CFS is a bit towards the serious side. National Health Organizations have estimated that around 1 million Americans suffer from this disorder, while around a quarter of a million people in the United Kingdom have this problem.
Insight
If you are a woman, you are more likely to suffer from this problem. Moreover, it usually exists in adults, and is not prevalent among adolescents and children. However, you should understand that CFS completely disrupts the quality of your life, because it will render you unable to perform your daily activities.
Causes chronic fatigue syndrome
If you are wondering about the causes of this particular disorder, then you will be disappointed. Despite heavy research, there have been no identified causes of this particular disorder. Generally, no research has pointed towards one particular reason, but this condition can arise due to multiple reasons. Many researchers have concluded that it could arise because of infectious agents and virus. 
However, others also state that it could be caused because of a dysfunction in the immune system. There is a school of thought, which has conducted multiple laboratory studies and has stated that this could be caused because of physical or emotional stress. This leads to decreasing the activity of the hypothalamic-pituitary-adrenal axis, which eventually causes changes in the release of corticotrophin-releasing hormone (CRH), cortisol and other hormones. This results in the dysfunction of the immune and other body systems. This significantly affects other behavioral patterns.
Conclusion
Therefore, if you feel that you are suffering from this problem, it is worth getting it checked from the doctor.