[bezoar (OP)]

When I was younger, I could work out at the health club, sit in the sauna for half an hour, and only have a few beads of perspiration on my upper lip.  Now, I go outside to work in the garden and in a few minutes I am literally dripping perspiration, something I never did when younger.  Admittedly, it’s been quite hot and humid outside, but it seems now, in general, I perspire more than ever before.  Is there some reason why?

[Bored chemist]

Have you put on weight since then?
If so, you are working harder and better lagged.

[paul cotter]

A lot of medications can cause excessive sweating with mild temperature challenge. Two groups in particular are opioids and tricyclic antidepressants though there could be many more.

[bezoar (OP)]

Have put on some weight but not obese.  Not taking opioids or tricyclics.  Could it be the Synthroid?

[paul cotter]

That's a possibility, depending on dose titration. If your t3 and t4 levels are in the normal range I would say no. An excess level of thyroid hormone will trigger sweating, racing heartbeat, anxiety and a host of other nasties. however it usually causes weight loss. When were your t3, t4 levels last checked?

[bezoar (OP)]

They are checked every 6 months and in normal range.  Maybe it’s just an old age thing?

[alancalverd]

It's a question of genetics and succession.

The only human who definitely doesn't sweat was at one time fourth in line to the Throne of England. Charles and Anne have similar genes but the Palace retains a dignified silence on the matter of their perspiration.

Assuming you have royal blood, you would have been born with some of that desirable characteristic, but as time moved on and grandsons were born, the Duke of York moved down to ninth, so the magic has worn off and us lowly mortals with numbers above 1000 are  now indistinguishable from the common herd when the sun shines.