Playback singer Alka Yagnik has revealed that she was diagnosed with a rare hearing disorder some weeks ago,

a "sudden, major setback" that she says caught her completely unawares.

Fill in sIn a post on Instagram on Monday night, Yagnik, 58, ome text

said she has been diagnosed with "sensory neural nerve hearing loss" due to a viral attack.

"To all my fans, friends, followers and well wishers.

A few weeks ago, as I walked out of a flight, I suddenly felt I was not able to hear anything.

Having mustered some courage in the weeks following the episode,

I want to break my silence now for all my friends and well wishers who have been asking me why I’m missing in action."

"It has been diagnosed by my docs as a rare sensory neural nerve hearing loss

due to a viral attack... This sudden, major setback has caught me completely unaware,"

the two-time National Award winner wrote.