usually CFS patients when they undergo medical tests don't have anything wrong with them clinically/pathologically. (They may develop medical conditions further down the line due to a restricted lifestyle). That means drugs are not the answer, although they might reduce some of the symptoms.
That may be the case for "cfs" patients but not so the case for those of us who have ME when a doctor does tests into the areas which often show up ME abnormalities.
eg some common abnormalities I myself have which are often found in ME patients are:
1/ Vitamin D deficiency (one kind of mine is normal while the other is very low..showing Im using it faster I can convert it.. something in my body is using it all fast)
2/ low ferritin (iron storage)
3/ abnormal EEGs on our brains (2 out of the 3 Ive had done have been abnormal). Our brains show certain non specific abnormalties
4/ abnormal Rombergs (shows neurological issues
5/ Low testosterone
6/ low cortisol
7/ borderline low white blood cells (said to indicate chronic infection)
9/ POTS, dysautomonia, narrowing of the pulse pressure, orthostatic hypertension, orthostatic hypotension I have all 5 different kinds of dysautonomia Dr David Bell finds in his ME patients
8/ (I cant think what else right now but I probably have 1 or 2 more... I havent even had all the ME recommended tests looking for the ME abnormalies done either.. I havent had the recommended for ME immune tests done).
Anyway.. there are LOTS of abnormalities found in ME and if you have ME you should test positive to some of these if right tests are done.
Most ME patients will need a drug or more to treat the issues ME causes. Im on 7 prescripton drugs.