My sons bloods came back today and the surgery phoned with the results. His cholesterol is much lower than average, and everything else looks good, except for his thyroid. Ten years ago I took him to a Doctor (I've since changed to a different one), and explained how he always seems to have very shaky hands. The Doctor simply said he is of a nervous disposition. Now it turns out it could be hyperthyroidism and is due for a backup blood test in march. They said his results were just borderline. Having read about this disorder, many of his symptoms seem to match. What worries me though is, could his lower than average cholesterol simply be due to a speeded up metabolism? If he is put on medication will this increase.