New Delhi, June 18 (IANS): Veteran Bollywood singer Alka Yagnik, who revealed that she has been diagnosed with a "rare sensory hearing loss" due to a viral attack, has suffered a type of hearing loss caused by damage to the inner ear or the nerve pathways that transmit sound from the ear to the brain.

According to Dr Manish Munjal, Vice Chairman, ENT, Sir Ganga Ram Hospital, Delhi, sudden sensory hearing loss is a medical emergency as it can become irreversible if not aggressively treated in 48-72 hours.

"The centre of the problem is the inner ear organ called Cochlea, where it happens due to damage to the hair cells," Munjal told IANS on Tuesday.

The causes may range from simple viruses like Herpes, Varicella, and Mumps or sudden loud exposure to noise levels above 85 decibel (dB).

Munjal also mentioned that this disorder may also result from more serious causes like painkiller overdose, chemotherapy, tumour compression, meningitis and stroke.

"The need of the hour is usually to rush to an ENT specialist to get the necessary ear examination done as well as get an audiometry test. Once diagnosed, the treatment may require a cocktail of antivirals, oral and intratympanic steroids, as well as rest from noisy environments," he stated.

According to the doctor, once the treatment is initiated, the chances of recovery are usually 70 per cent and above.

The disorder affects only 1 per cent in bilateral ears as compared to single ear, Munjal noted.