Can you hear "the hum"?

Katie Jacques, from Leeds, told the BBC: ‘It’s a kind of torture; sometimes, you just want to scream.
‘It’s hard to get off to sleep because I hear this throbbing sound in the background.  You’re tossing and turning, and you get more and more agitated about it.’ 

Those who hear it can experience headaches, nausea, dizziness, nosebleeds and sleep disturbances, and the BBC reported at least one suicide as a result of the noise.