It's in your best interest to keep the noise in your life to a minimum. Blood vessels constrict, pressure rises, and cholesterol and triglycerides also rise. The increased hormonal activity steps up the secretion of acid in the stomach, possibly causing ulcers. In addition, loud sounds affect the level of white blood cells and gamma globulin in the bloodstream, lowering the efficiency of the immune system.
Low frequencies are a dull rumble, high frequencies a shrill whine.
As we get older, frequency response drops. The human ear is most sensitive to sounds in the 1 to 4 kHz range, the usual frequencies of human speech, and damage occurs first in these areas. Hearing loss is a gradual process unnoticed by the loser. Above 105 dB, your hearing can be damaged by repeated 15-minute journeys. Motorcyclists risk hearing loss.