One of my roles is as the administrative lead for a chronic fatigue service for adolescents. I think chronic fatigue is a good name for ME, and it covers a wide range of symptoms/problems such as abdominal pain, vomiting, constipation, hypermobility etc... I'm not clinical, but my understanding is that there are virus's that can knock children down for a while and they can take a bit of recovery from, like glandular fever. However, I would happily say that most of the cases we have (we tend to get the really complex ones) have an extremely large psychological element; which is not to say that they don't feel the symptoms they describe, they clearly do but the brain is incredibly powerful. Also, some of the parents are not helpful, either more anxious than the patients or completely not engaged, however we can at least work with the anxious ones, but the anxiety or lack of engagement transfers to the kids too and that's 'challenging' (for want of a better word). Lack of engagement can actually lead down the child safeguarding route.
In terms of treatment, the multi-disciplinary team uses physiotherapy, occupational therapy, rehabilitating admissions for a week, group sessions and psychology/psychotherapy as well as throughly investigating medical symptoms appropirately as the family and patient have to be assured that nothing serious is going on anywhere else and that the medical team is really listening to them.
Overall, I think it's a sad thing to effect young people who should be enjoying their teenage years (as much as it's possible to enjoy being a teenager). One thing I haven't mentioned is how high achieving most of the patients on my book are/were; we have patients who have been incredibly sporty and at the top of their games previously, dancers, musicians and extremely academic patients who have had been anticipated to get A* in their exams. Mainly I believe in the work the team do, in that we can help with the illness as a whole as it effects you but it needs a robust psychological/psychotherapy input as well, it's important not to medicalise everything. We have a good success rate.
I do however wonder about third world countries/poor countries and it has occured to me that is chronic fatigue syndrome an illness of the western world? I haven't actually asked any of the team yet but I'm interested to pick some brains. I might do that next week actually :c)