Humidifier itself is harmless to the human body, the use of which helps to relieve indoor dryness, improve indoor temperature and humidity, etc.. However, improper use of the human body can form hazards such as humidifier pneumonia, allergic asthma, etc., can also increase the burden on the kidneys, resulting in human discomfort. In addition, if suffering from rheumatism, rheumatoid arthritis patients need to use humidifiers carefully, because humidifiers make the air humidity, prone to induce the occurrence of arthritis. Common in the following cases: 1, induced respiratory disease: humidifier water is not replaced for a long time or use tap water, which can make the mineral deposits in the humidifier, promote the growth and reproduction of microorganisms, easy to produce bacteria, mold, etc.. In addition, if long-term cleaning or cleaning is not in place, when used again, pathogenic bacteria released into the air with the water mist, and the humid environment is conducive to airborne dust mites, mold active, inhalation of the human body, the container induced allergic asthma, pneumonia and other respiratory diseases; 2, induced joint disease: the use of humidifiers can make the environment humidity increases, due to the humid environment leads to slow local blood circulation in the joints, inflammatory cells gathered in the joints The joint is a very important part of the body’s health, stimulating the local nerve endings of the joint to cause pain, long-term for their own rheumatism, rheumatoid arthritis patients, easy to induce arthritis attacks; 3, increase the burden on the kidneys: If you are in a high temperature environment using a humidifier, can lead to high humidity in the air, causing discomfort in the body such as chest tightness, head swelling, etc.. When the humidity is too high, the skin can not evaporate sweat, so that a large amount of fluid in the body to the kidneys, the kidney function burden, kidney disease patients will aggravate the disease. Therefore, it is recommended that the use of humidifiers pay attention to regular cleaning, diligent water replacement, is not recommended for 24-hour continuous use, intermittent use is better.