Saying nothing but I'm 'sorry' didn't occur to me as when people generally face difficulties words of hope or encouragement are often welcomed. I imagine that's why most people do it and it really doesn't come from a thoughtless place.
That's the point of threads like these though - so people who are involuntarily childless can offer their POV about what is and isn't helpful
I don't expect people to automatically know what to say, that's why I'm quite militant about being very open about my infertility, and how many infertile couples would wish to be supported
Hope and encouragement are lovely and thoughtful - but what isn't helpful is projecting
Imagine a friend is diagnosed with cancer
Wishing them well for their treatment and saying you hope it's successful, saying it must be so difficult and asking how best you can support them - no one wouldn't be grateful for messages of support like this
But other things might be trickier
'You'll get there, I know it' (you don't know that, no one does, and that's my greatest fear)
'Have you thought about radiotherapy?' (I have a team of specialists who are recommending the right treatment for me, your suggestions for how to manage my medical condition are well intentioned but desperately unhelpful, as these are issues I wrestle with every day)
'Well at least there's always a radical mastectomy' (any sentence starting with 'at least...' is very likely to minimise a situation of great pain and suffering)
'everything happens for a reason' (what fucking reason is that?)
'life doesn't send you what you can't handle' (what did I do to deserve this?)
I'm not for one moment trying to equate infertility with cancer. But on a previous thread like this, a comment from one poster really stuck with me. She had experienced both infertility and breast cancer - and thankfully had successfully beaten both conditions. She said that during her cancer treatment, she very much wanted to live - whereas during her infertility treatment, she wanted to die
That really resonated with me.