Triggers include trauma, infection , vaccination, pregnancy, and many more. Causes include infections, heavy metal or pesticide poisonings, and malnutrition.
A good awareness video about ME/CFS can be found here:
The WPI stands for the Whittemore Peterson Institute, a charity in Nevada. http://www.wpinstitute.org/ They are funding research into ME/CFS and other neuroimmune illnesses like fibromyalgia, autism, and gulf war syndrome.
- (via redtoffee at crisis_911)