The use of raw onion fumigation to relieve nasal congestion is a traditional home remedy. Its volatile components (such as sulfides) may help irritate the nasal cavity and temporarily relieve nasal congestion. The following are the specific operation methods and precautions： --- ###**Operation steps：** 1. **Prepare onion** -Choose fresh white onions or purple onions (purple onions are richer in sulfur compounds). -Peel off the skin, chop or cut into thin slices (destroying the cell structure can release more volatile substances). 2. **Fumigation method** -**Direct inhalation method**: Put the chopped onion in a small bowl, close to the mouth of the bowl about 15-20 cm, and take a slow and deep breath with your mouth and nose for 5-10 minutes each time, 2-3 times a day. -**Hot steam enhancement method**: Add onion slices to a bowl of hot water (non-boiling water to avoid scald), cover your head with a towel to form a steam hood, and inhale onion-flavored steam (similar to ordinary steam inhalation method). 3. **Auxiliary use** - Onion slices can be placed on the pillow or on the bedside table to help you breathe smoothly at night with the help of volatile ingredients (the effect is weak). --- ###**Precautions：** -**Irritating**: The smell of onion may irritate the eyes or respiratory tract. If you feel unwell (such as coughing, burning sensation), stop immediately and ventilate. -**Allergy risk**: It is forbidden for those who are allergic to onions, and should be used with caution for people with asthma or sensitive physiques. -**For children**: Children's nasal cavity is more fragile, it is recommended to use a milder saline spray or humidifier instead. -**Non-alternative treatment**: If nasal congestion lasts for more than 3 days, accompanied by fever or pus, it may be a bacterial infection and you need to seek medical attention. --- ###**Other suggestions：** -Safer options: rinse with saline water (such as a nasal wash) or menthol nasal ointment (for adults). -Keep the air moist: using a humidifier or bathroom steam can also relieve nasal congestion. Onion fumigation may provide short-term relief, but the effect varies from person to person. If the symptoms persist or worsen, it is recommended to consult a doctor.