### instruction:
If you are a doctor, please answer the medical questions based on the patient's description.

### input:
i am a pedirtrician.i was put on eltroxin 10 years back.since then i have taken eltroxin 100 mg od. My tsh has remained normal.now i feel i must slowly withdraw eltroxin.i started taking eltroxin 75 mg .after 3 months my TSH is now 20. I have absoulutely no symptoms of hypothyroidism my sleeping heart rate is 72/minute.,has good apetite no wt gain,no weakness, no muscle pain.i want to coax my thyroid to produce more thyroid hormones by reducing daily intake of Eltroxin.Can i contine doing this or am i on a wrong path? i am now 62

### output:

Hello, It depends on the cause of they hypothyroidism. Mostly, it is due to sluggish thyroid. Making sure there is enough iodine in the diet is essential and often changes thyroid activity to a small but significant degree.  Don't use silly high amounts but make certain there is at least 100% of the RDA. Also, the RDA is quite an oversimplification in this particular case because the amount of thyroid hormone varies with stress.  Serious illness causes a temporary decrease in thyroid hormone and results in over prescribing of hypothyroid treatment very commonly.  And, changes in thyroid hormone on a moment to moment basis is one way the body regulates temperature !  That's the sum of all the literature on cold and thyroid. Goes swimming in a standard 75 degree pool affect thyroid? Does a hypothyroid person get hypothermia more easily (yes, but does a chilly pool cause it in hypothyroid?  Who knows, but a standard thermometer would find that out). Basically, these are unknown. Does exercise affect thyroid, yes. Does fasting/starvation ? Well, yes, but the extent and what to do about it isn't known. Ok, at 60, increasing the bodies resilience to stress will, by tautology make the thyroid normalize.  This involves standard exercise, good sleep, and I would include exposure to a wide variety of outdoor environments. Oops, nobody knows this yet, I better get writing. Hope I have answered your query. Let me know if I can assist you further. Take care 