(Newsweek) A rare ear condition has left a woman only able to hear women’s voices.

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.

The night before, the patient—only identified by her last name Chen—heard ringing in her ears and vomited.

The next morning, an ear, nose and throat specialist at Qianpu Hospital told Ms. Chen that she had a form of low-frequency hearing loss known as reverse-slope hearing loss. This meant she was unable to hear lower-frequency sounds, including the average male voice.