The woman from Xiamen, on China's east coast, knew something was wrong when she woke up and couldn't hear her boyfriend's voice, MailOnline reported citing AsiaWire.
Reports claim that the woman was suffering from nausea and ringing in her ears the night before she woke up with this conditon.
Doctor Lin believes fatigue and the added stress of long days may have contributed to the condition, which caused a loss of sensitivity to deeper sounds, and which only allowed her to hear sharper, higher-frequency sounds - such as the voices of women. The female doctor who treated Chen said that she was able to hear her without any problem but she was unable to hear aything which was said by a young male patient.
What do you think about this unusual form of hearing loss?
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She immediately drove to the health-care centre looking for answers - but found very few. "We don't know who this person is yet". "I stay here pretty much 24/7". "I put a note on the door for no males to be coming in to do any checks, only females".
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Anyone who suffers from low-frequency hearing loss, generally, can't hear noises that have a frequency of 2,000 Hz or below. Because of the way it is shaped on an audiogram - a diagonal slope from the top left-hand corner to the bottom right-hand corner - it gets its name, ski-slope.
Any damage to the cells can impact a person's hearing because the hair cells make the sound travel from the outer ear to the brain. Autoimmune disorders that affect the inner ear - which are thought to occur in about 1 percent of the USA population - may also be a cause of RSHL, Clark said.
Although there are a number of causes of reverse-slope hearing losses, the most common causes are genetic abnormalities, Wolfram syndrome and Mondini dysplasia. Less often, a shift in the pressure of ear fluid can trigger reverse-sloping hearing loss. That figure is expected to rise to over 900 million by 2050.
To clarify, the woman can only hear voices belonging to other women.
It has been linked to genetics and can be triggered by certain diseases (for example, Ménière's disease) and viral infections.