Humidifier ultrasonic waves are generally not harmful to the human body, humidifier ultrasonic waves is a mechanical wave, just similar to sound waves, so generally correct use will not cause harm to the human body. The impact of ultrasound on the human body is mainly manifested in the thermal effect and cavitation effect in two aspects. Thermal effect refers to a part of the ultrasound propagation process of energy is absorbed by the human body tissue, and converted into heat, so that the tissue temperature rises, making the human body tissues slightly hot, so that the body of water molecules, such as combustion. Cavitation effect refers to the existence of micro-nuclear cavitation bubbles in the human body under the action of sound waves vibration, when the sound pressure reaches a certain value when the growth and collapse of the process, but also the human body tissues will be slightly warm. If you find discomfort after long-term use, you should immediately stop or seek medical attention in a timely manner, and it is recommended that you use the humidifier correctly, so as not to have an impact on the body.