Signs and symptoms of acoustic neuroma are often easy to miss and may take many years to develop. They usually happen because of the tumor's effects on the hearing and balance nerves. Pressure from the tumor on nearby nerves controlling facial muscles and sensation (facial and trigeminal nerves), nearby blood vessels, or brain structures may also cause problems. As the tumor grows, it may cause more noticeable or severe signs and symptoms. Common signs and symptoms of acoustic neuroma include: 
Hearing loss, usually gradually worsening over months to years — although in rare cases sudden — and occurring on only one side or more severe on one side
Ringing (tinnitus) in the affected ear
Unsteadiness or loss of balance
Dizziness (vertigo)
Facial numbness and weakness or loss of muscle movement
 In rare cases, an acoustic neuroma may grow large enough to compress the brainstem and become life-threatening. When to see your doctor See your doctor if you notice hearing loss in one ear, ringing in your ear or trouble with your balance. Early diagnosis of an acoustic neuroma may help keep the tumor from growing large enough to cause serious consequences, such as total hearing loss.