HYPOTHYROIDISM is much more common in females than males. when ds#1 was 14 he recovered from the flu but never seemed to bounce back. he slept alot, had little interest in activities that he previously enjoyed, complained of being cold. one afternoon he stumbled when he got up off of the couch to a standing position. he said he had a "head rush". he thought that was "normal". i checked his bp lying, sitting and standing. he had orthostatic hypotension. coupled with his other symptoms i took him to the peds and requested that his thyroid be checked. thyroid issues in teens are infrequent. in males, more infrequent. his thyroid also was hardly functioning. following the flu he developed Hashimoto's thyroiditis. we saw an endocrinologist, he was placed on synthroid and was markedly improved in 2 weeks. because of his young age, dh weaned him off of the synthroid a year later. he did so very slowly. he felt that there was some evidence that a thyroid could rebound in non adults. it did. i would have his doctor check his thyroid. its a long shot but sometimes long shots pay off.