When used in an oil burner (a few drops in water), the vapours of lemon oil can be used for colds, laryngitis, headache, and flu. Smelling the aroma is said to be helpful for mental hiccups like depression, irritation, stress, lethargy, and fatigue. When a few drops are added to the bath or when blended into a massage oil, it is said to relieve lack of energy and tiredness. It is also said it can help get rid of hangovers.