Chronic fatigue syndrome
It is not only a body of people that is influenced by a good number of different diseases but it is also their psychic and soul. Indeed, during ages people deal with the question about what of greater importance is. They make their decision between mental and material, or between spiritual and material, doesn't matter. The thing is that people realize that there is no way for them to live without material stuff but they are also sure that it will be difficult for them to live without spiritual stuff. People are strange creatures and no matter how much they have they always want more.
That is why people are thirsty for mental stuff when they have enough of material stuff and they are thirsty for material stuff when they are okay with mental stuff. See, it is a common way of life and mind of people. They are not able to be happy about things they already have, they always want more. And the thirstiness to have more is the main reason for people to lead the way of life they lead today. Most people (it will also be okay to say "all people") are thirsty for having a mass of different material stuff. They want to have best cars, they want to wear the best clothes and they want to live in the best houses.
There is no way for people to get all that stuff just like that and they know it for sure. So, people do their best in order to earn more money and buy everything they want. Though, once they get everything they want – they want more. So they work, they earn their money and they have no time for anything else. They don't even have time to spend the money they have; they do it with the help of internet shops, as a rule. Such way of life and such a thirstiness make people work harder and harder and soon they get tired and there is no way for them to get rid of that tiredness because they have no time for rest. And that is how the problem of chronic fatigue syndrome appears, the syndrome common for all the people of this world and this time. They are tired and they have no time to have a rest.