When used in an oil burner (a few drops in water), the vapors of lemon oil are used for colds, laryngitis, headache, and flu. Smelling the aroma is helpful for mental hiccups like depression, irritation, stress, lethargy, and fatigue. It lifts the spirits and clears the mind. When a few drops are added to the bath or when blended into a massage oil, it is said to ease digestive problems, lack of energy, tiredness, infections, obesity, rheumatism, depression, and stress. It is also used to help get rid of hangovers.