I'm not sure but there have been proposals like it being biological, a psychological, genetics or infectious mechanism.
Nobody knows yet, man.  I'm sorry.  Some scientists think it's biological or genetic, and some think it's psychologically based.
I do not have much energy Are you having trouble carrying out normal daily routines?  Could be chronic fatigue syndrome. I am thinking so, maybe i need to see a doctor on this It isn't something that can be cured, but chronic fatigue syndrome can be managed. How can i manage it There are two treatments, one is called graded exercise therapy, the other is cognitive behavioral therapy. i will try and do both. But what is the cause of this
Biological, genetic, infectious, and psychological mechanisms have been proposed, but the cause is not understood.