Most cases of “sudden” hearing loss are viral and patients are usually treated with steroids. Patients with mild degrees of hearing loss can recover 100% of their hearing. The diagnosis of bilateral sudden sensorineural hearing loss may also be caused by trauma, autoimmune inner ear disease, meningitis, syphilis, HIV, or certain drugs (such as ibuprofen or medication to treat cancer). The most common viruses that can cause hearing loss include measles, Varicella-Zoster Virus (the virus that causes chickenpox and shingles), and the mumps.