Q: How do i get my iphone 5 to stream to my hearing aids? Do i need a additional streaming device? Thanks

What kind of hearing aid?

You can check for compatibility Here

Quote:

"Some hearing-aid manufacturers offer special "bridge" hearing-aid accessories that receive audio through Bluetooth from the iPhone and retransmit that audio using proprietary wireless audio-streaming technologies built in to some hearing aids. Check with your audiologist or hearing-aid manufacturer for more information."

From here:

http://support.apple.com/kb/ht4526