Ringing in the ears is a common complaint of MSG sufferers. Many disease states
and also prescription drugs also affect ringing in the ears, because they directly affect
the body's use of neurotransmitters.
It is not surprising that MSG also affects hearing considering that glutamate is what
the hair cell in the ear uses as a neurotransmitter. See the following link:
http://www.med.wayne.edu/Wayne%20Medicine/wm2000/hearingpreservation.htm