It is not recommended to use raw onion fumigation to relieve nasal congestion. The pungent smell of onion may cause respiratory discomfort, cause cough, tears and other symptoms, and aggravate the body's discomfort. There is no scientific basis for this method to prove that it has an exact effect on relieving nasal congestion. Nasal congestion can be caused by a variety of causes, such as colds, allergies, sinusitis, etc. If the symptoms of nasal congestion are mild, you can try to relieve it by nasal drops or nasal sprays with saline water, inhaling hot steam, and massaging Yingxiang acupuncture points on both sides of the nose. If the symptoms of nasal congestion are severe or last for a long time, it is recommended to seek medical attention in time, clarify the cause, and carry out standardized treatment under the guidance of a doctor, such as the use of drugs for treatment, etc., do not try unscientific methods by yourself, so as not to delay the condition or cause adverse consequences.