The patient must have 4 of the following symptoms, which must have persisted or be recurrent for 6 or more consecutive months of illness, and must have not been preceded by fatigue: a) self-reporting of poor short-term memory or decreased ability to concentrate, as severe as to alter the previous functional ability, b) dry throat, c) armpit and cervical adenopathies, d) muscle pain, joint pain without redness, deformity or swelling, de-novo headache, e) unrefreshing sleep, and malaise post exercise that lasts more than 24 hrs.