Can a canary be kept alone?

[Emu Queen]

I was reading on some site that loud noises can give them a heart attack which is kind of worrisome, I wonder how they fair during thunderstorms? Are they that fragile? Also, prone to various mite infections I read.

This is about the sound and not the mites. I have had a canary for 6 years now and I have never had sound problems with him. I've had some loud thunderstorms around our house and he's never had any problems. I wouldn't be worried much.