In the opinion of my neurologist, my tinnitus is not related to MS, but it began during the same period when I was having real exacerbations (optic neuritis, trigeminal neuralgia) just before I was diagnosed. Some days now it is louder than others, and recently I have reacquired the startle reflex that is seen in infants. The noise doesn't have to be loud to startle me, just unexpected. More disturbing is that I seem to have also picked up an aural memory (I don't know how else to describe a remembered sound) that I "hear" though I know it isn't real at the moment, e.g., a train whistle that wakes me from sleep though the nearest train track is many miles away. If MS can damage the optic and facial nerves, why not those of the ear?