Just a question. My TSH came out 2.17 which is well within the normal range. But I have symptoms like 30pounds weight gain (which could be due to PCOS too or hypothyroid).
Many people who don't have thyroid problems and have never taken thyroid medication in their life will have a TSH of around 1 or 2+. So it's really important to consider wherever you've been diagnosed hypothyroid previously. This is what i've noticed, people on thyroid medication for diagnosed hypothyroidism tend to say they feel better with a TSH of 1, i just don't think it's so necessary to have a TSH that low if you arn't medicated for hypothyroidism already. It would be insane if every person who had a TSH of 2 got diagnosed with hypothyroidism. Half the population would be diagnosed with it.
Weight gain can be and usually is caused by many other factors unrelated to thyroid illness.
There probably is a very small chance that someone, previously undiagnosed, never treated for hypothyroidism before, could have a tsh of 2 and be hypothyroid. This would indicate a problem with the pituitary gland in sending TSH signal though and that's such a rare thing to have it makes it extremely unlikely. A simple Free T4 test would help a lot in a case like that.
I have to comment here that it's NOT highly unlikely as I myself only had a TSH of 1.84 on diagnosis and most people I know in fact had a TSH hovering around that point at diagnosis.
The TSH test alone is hugely fallible and should never be looked at in isolation from T4 & T3 when considering a diagnosis of hypothyroidism.
I agree that if everyone with a TSH of that level were treated for thyroid disease it would be a much higher number than are treated now but I actually think that would be the right thing to do in most cases as thyroid disease is widely under diagnosed.
Most people I know that have had their thyroid checked as part of routine tests or because they were ill and it was down to something else had a TSH around the 1 mark.
The TSH levels are set in a bell curve (and as with any bell curve reference there are always people that lay outside of that which is why isn't always dangerous to have a lower TSH reading) - and in fact it's an unneven curve that does point more towards true 'normal' as being closer to 1.
Included in the original set of patients for the study group to make that TSH reference range in the first place were people that also had thyroid antibodies but as yet no clinical signs or symptoms that could be attributed thyroid disease.... well they didn't 'catch up' with those patients later on to find out if they'd developed symptoms or been diagnosed with thyroid disease did they? So the actual test is based on very shoddy science.
Also, given what we know about the many symptoms of TD compared to what doctors actually think are the signs and symptoms I would question how many of the patients in the original sample group actually were symptomatic but didn't know it.