The number of views on this topic says it all - many BC patients will be put on letrazole ( or one of the other aromatose inhibitors) and many will have side effects.
For some the side effects will be mild, for other they will be more.
You will only know once you start.
Some oncologists still tend to downplay the side effects ( reason to find a new oncologist) but they are real and common.
A change to a different one sometimes helps as does exercise, acupuncture, massage or a variety of supplements depending on the type of side effect.
Always discuss with your oncologist before trying any supplements or “ alternative therapies” as they may in fact counteract the drug.
My favourite comment on here was from someone who said the most important side effect of these drugs was she was still alive .
Like so many things to do with BC , it isn’t easy.