Many people with nasal congestion find that inhaling steam helps them feel better. They may use a bowl of plain water, adding chamomile or peppermint oil, or take a warm shower.
People should take care not to use boiling water, however, and they should always place the container on a flat, level surface.
The warmth and moisture can be soothing to the membranes inside the nose, providing temporary relief. There is also a theory that it allows mucus to drain better and that it may help kill the virus. However, science has not confirmed these theories, and there is no evidence to suggest that it improves symptoms.
The results of an older 2016 trial suggested that steam did not he an impact on nasal congestion due to recurrent sinusitis. Also, a 2017 review found no evidence to suggest that steam can either benefit or harm a person with a common cold.