Some claim that topical application and inhalation of essential oils can help alleviate symptoms of sinus congestion. For example, one in vitro tissue study suggested that 1,8-cineole, the main component of eucalyptus oil, may he an anti-inflammatory effect on human tissues. Further research is necessary to assess the efficacy of these oils in human cases.
To alleviate sinus or upper respiratory infections, people often use oil externally on the temples or chest or inhale via a diffuser when the oil is added to boiling water. Make sure you only use food-grade essential oils. Rub one drop of each oil on the roof of your mouth, then drink a glass of water.
It is important only to use essential oils as directed, as inhalation can cause airway irritation and potentially worsen symptoms.
Learn more about using essential oils to treat sinus congestion here.