Laryngeal edema is an infiltration of tissue fluid under the mucous membrane in the laryngeal slough. There are two main categories of etiology: infectious and noninfectious. Infectious laryngeal edema can be caused by acute laryngitis, acute epiglottitis, acute laryngeal chondritis, laryngeal abscess, laryngeal tuberculosis, laryngeal syphilis, etc., as well as acute suppurative inflammation of the pharynx or neck; noninfectious laryngeal edema can be caused by heart disease, nephritis, cirrhosis of the liver, hypothyroidism, anaphylaxis or hereditary, such as injections of penicillin, oral intake of drugs such as potassium iodide, aspirin, etc., and the consumption of allergenic foods such as fish, shrimps, crabs, etc. How to prevent laryngeal edema? 1, do not speak No matter what causes you to produce laryngeal edema, the most important thing is to let your vocal cords rest for a period of time, and even whispering should be avoided. 2, drink more water Experts recommend drinking 8-10 glasses of water a day, you can also drink fruit juice and lemon tea. The best thing to do is to drink lukewarm water, cold water will only make the problem worse. Breathe through your nose. Breathing through your nose is a natural way to keep your throat moist. 4, quit smoking Smoking is the main cause of dry throat. So when you suffer from laryngitis, you should quit smoking. 5, choose the right lozenges Avoid lozenges containing mint, preferably honey or fruit flavored lozenges. Certain medications should be avoided Certain medications may dry out your throat. These drugs may include blood pressure lowering agents thyroid drugs and antihistamines, if you are not sure, you can ask your doctor. 7. Speak with a microphone If you have a job that requires you to raise your voice, you can use a microphone to amplify your voice and not strain your vocal cords. In addition, if you will go on stage to speak, but find your voice hoarse, it is best to postpone it, so as not to cause long-term damage to the vocal cords. 8, training vocalization You should practice vocalization if you have to speak or talk often. In untrained vocalization, the muscles in the throat press against each other. With trained vocalization, these muscles will work together. 9, avoid spicy and stimulating foods Spicy and stimulating foods can add fuel to a swollen and sore throat. Greasy food is also not conducive to recovery. 10, the use of cold air humidifier The mucous membrane over the surface of the vocal folds needs to be kept moist. If the mucous membrane is dry, it will become more viscous and become an excellent adsorbent for allergens (or irritants). The use of an air humidifier can help solve the problem.