Thyroid *TSH

What did your GP say when he/she reviewed the test results with you? TSH 0.52 is the lower end of what the NIH has established as the normal range, but it’s meaningless without the context of your age, gender, other health issues, medications you may be taking, to name just a few factors, and - most importantly - whether you’re experiencing common symptoms of hyperthyroidism. A medical professional will evaluate all of the above, order additional tests if warranted (TSH is only one of many thyroid function indicators that can be evaluated), and go from there.

Thanks for the response! I get a general blood test through my local hospital every few months to check iron and other levels. Just noticed that the TSH levels were highlighted as abnormally low.

I am a 23 y.o Male, mostly healthy, only take supplements such as Calcium and Iron, eat healthy, and run about 90 MPW. I feel fatigued and have the general symptoms of hyperthyroidism (according to google), however not sure if those symptoms, fatigue- for instance, is from training / day to day life.

Many of hyperthyroidism symptoms are similar to those caused by any other number of diseases/deficiencies/syndromes or - as you said - overtraining or just plain life. I’m not an elite runner nor do I know your training particulars, so I’m not one to guess at whether you’re overtraining or not. As for your TSH falling into the lower range of normal, the first thing I’d look at is how it compares to previous year’s results. If it’s significantly lower than a year ago - I’d definitely make a follow up appt to discuss results with whoever ordered the tests for you.

Otherwise, as the saying goes, you’re hearing hoofbeats and thinking zebras. Statistically, if there’s a medical reason for your fatigue (as opposed to overtraining, for example), you’re more likely to be suffering from a vitamin D deficiency. “Eating healthy” and even outdoor running doesn’t necessarily get you to sufficient levels because very few foods contain enough D3 for maintenance levels, and your skin will synthesize enough of it only if you’re pale, live pretty far south (think Florida), and expose enough skin area without any sunblock at the right time of day. It’s estimated that over half of all Americans are vitamin D deficient, and very few are at optimal levels. December and January in our hemisphere are the toughest months for maintaining proper vit D levels, so if you’ve been feeling more fatigued lately, it’s something to think about.

To be clear, I’m not saying your fatigue is caused by that particular deficiency - I’m merely saying that’s statistically speaking that would be a more likely culprit than lower range TSH levels.

See a doctor. Ask for B and D levels. Then see him/her again. Don’t diagnose yourself on Google.

Good luck.

When the thyroid gland is overactive (hyperthyroidism) the body’s processes speed up and you may experience nervousness, anxiety, rapid heartbeat, hand tremor, excessive sweating, weight loss, and sleep problems, among other symptoms.

There are medications to lower your thyroid levels. Lithium is one (also used for bipolar).

Luckily synthetic thyroid (levothyroxine) is an effective medication and they can destroy or remove your thyroid to easily treat it. I would keep getting blood tests and see if it's not something else causing it. An endocrinologist might be better than your GP.