The booming U.S. economy, in which imports tripled from $23 million in 1790 to $78 million in 1807, brought in far more tariffs to pay off the debt. Still, the deficit-cutting plan hit a setback when Jefferson decided in 1803 to add $15 million of debt to the mound he inherited.
Prolonged exposure to loud sounds is the most common cause of tinnitus. Up to 90% of people with tinnitus have some level of noise-induced hearing loss. The noise causes permanent damage to the sound-sensitive cells of the cochlea, a spiral-shaped organ in the inner ear.
Quick Answer. Ringing in the ears, otherwise known as tinnitus, most commonly occurs due to old age, nerve damage and frequent exposure to loud noises, according to WebMD. Tinnitus can also be caused by ear infections, thyroid disease, earwax buildup, eardrum ruptures, inner ear injuries or as a side effect of medications. Keep Learning.