A schwannoma is a benign tumor that grows from the nerve sheath, the insulating wrap around nerves. It usually shows up on one side and expands slowly, giving the body time to send early hints before any major damage occurs.

The first hint is a one-sided hearing change. Sounds feel distant, you raise phone volume, and voices seem to echo in a tunnel.

Next comes a “full” ear. The same ear stays plugged even after you pop it, yawn, or use drops.

Electric face zaps appear soon after. Quick jolts shoot across the cheek or jaw, last seconds, and feel like a dental problem until the dentist says teeth are fine.

Balance drifts. You veer when walking, miss the curb, or feel a brief spin when turning your head fast.

Some people hear an inside “whoosh” matching their heartbeat at night. Lying flat makes it louder; extra pillows quiet it down.

Later, the same side of the face may feel numb or the eyelid may blink slower, showing the tumor is pressing on nearby movement cables.