Doctors found that the source of permanent fatigue women, which they complain 3 times more often than men (and "men do not cry" here is not to do with it), can be a lack of iron in the body.
A simple experiment found that half of the cases receiving iron supplements made women feel much better. The same experience has shown the fact that women often willfully fatigue. 19% of the subjects receiving placebo also experienced improvement in health. The study was conducted on 198 women of reproductive age.