Answer:
What can you lose that will cause other people to lose theirs too?
I can be found after you remove 6 letters from BSAINXLEATNTEARS
I am the minerals vital for your good health.
I am a kind of coat that can only be put on when wet.
I am just two and two. I am hot. I am cold. I am the parent of numbers that cannot be told. I am a gift beyond measure a matter of course. I am given with pleasure when taken by force.
I fly to any foreign parts assisted by my spreading wings. My body holds an hundred hearts Nay I will tell you stranger things when I am not in haste I ride and then I mend my pace anon.