Low-intensity noise is not harmful to people's physical and mental health in general, and it is beneficial to improve work efficiency in many cases. High-intensity noise mainly comes from industrial machines (such as looms, lathes, air compressors, pickaxes, blowers, etc.), modern vehicles (such as cars, trains, motorcycles, tractors, airplanes, etc.), loudspeakers, noise from construction sites, shopping malls, sports and entertainment venues, etc. These high-intensity noises do harm to people's bodies, make people feel tired, produce negative emotions and even cause diseases. High-intensity noise not only damages people's hearing, but also affects the nervous system, cardiovascular system, endocrine system, digestive system, vision and intelligence to varying degrees. If people work and live in a noise environment of 95 decibels for a long time, about 29% will lose their hearing; Even if the noise is only 85 decibels, 1% people will be deaf; Noise of 12~13 decibels can make people feel pain in their ears; Stronger noise will damage the hearing organs. In the nervous system, strong noise can cause symptoms such as headache, dizziness, burnout, insomnia, emotional anxiety, memory loss, increased slow waves in EEG, autonomic nervous system dysfunction, etc. In the cardiovascular system, strong noise will cause changes in pulse and heart rate, elevated blood pressure, arrhythmia, conduction obstruction and changes in peripheral blood flow. In the endocrine system, strong noise will cause hyperthyroidism, enhanced adrenal cortex function, increased basal metabolic rate, sexual dysfunction, menstrual disorders and so on; In terms of digestive system, strong noise will cause digestive dysfunction, gastric dysfunction, decreased gastric acid, loss of appetite and so on. In short, strong noise will lead to a series of physiological and pathological changes in the human body. Someone once investigated 22 people who worked in an environment with noise up to 95 decibels. Among them, 39% were dizzy, 32% were insomnia, 27% were headache, 27% were stomachache, 27% were flustered, 27% were memory impaired, 22% were upset, 18% were poor appetite and 12% were hypertensive. This is a professional reference. Baidu knows.