Noise has been found associated with annoyance, stress, sleep disturbance, and impaired cognitive performance. Furthermore, epidemiological studies have found that environmental noise is associated with an increased incidence of arterial hypertension, myocardial infarction, heart failure, and stroke. There is now plenty of evidence that noise makes you sick. After carrying out a review of previous studies, they concluded that noise induces a stress response through the sympathetic nervous system, the system which activates the so-called fight or flight response. In turn, this increases hormone levels.