Thuja is effective mainly because of the stimulative and normalizing volatile oil it contains.  Against nasal catarrh, Thuja combines expectoration with a full – body stimulation which is also beneficial in case of heart weakness. It can also be used to help with problems such as urinary incontinence caused by the loss of muscle tone. Thuja should be avoided if the cough is caused by hyperstimulation, as in the case of dry cough.