… Not only can too much loud noise damage your hearing, or disrupt your sleep, it can literally suck the life out of you thanks to the human body’s fight-or-flight response. “The human auditory system is designed to serve as a means of warning against dangers in the environment,” explains Louis Hagler, a retired internal medicine specialist in Oakland, Calif. “Noise above a certain level is perceived by the nervous system as a threat.” The body responds to that threat with an outpouring of epinephrine and cortisol, the so-called stress hormones. “Your blood pressure goes up, your pulse rate goes up, there is a sudden outpouring of sugar into the bloodstream so the body is prepared to meet whatever threat there is in the environment.”
If exposures are intermittent or rare, the body has the chance to return to normal. But if the exposure is unrelenting, the body doesn’t have a chance to calm down, and blood pressure and heart rate may remain elevated, Hagler explains. That’s why what seems like a mere annoyance can actually have long-term health effects. “There is no question that people who live near a busy roadway are experiencing effects on their blood pressure,” says Hagler.
As Bean attests, once you tune into the din, it’s hard to tune out again. “It’s like an allergy — once you get sensitized to one of these things then they all bother you, and then each one builds on the other,” he says. And what’s a mere nuisance to one person is another’s b√™te noire. “There is no evidence that noise causes mental illness itself, but there is little doubt that it may accelerate or intensify some kind of mental disorders,” explains Hagler. He adds that symptoms of exposure to noise pollution include anxiety, nervousness, nausea, headaches, emotional instability, argumentativeness and changes in mood. No wonder excessive noise has been used as a form of torture. …
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Katharine Mieszkowski – Salon