According to traditional Chinese medical principles, polygonatum has sweet and neutral properties, and is associated with the Lung, Heart, Kidney and Spleen meridians. Its main uses are to tonify spleen and stomach qi (to improve appetite and reduce fatigue), to moisten the lungs (by reducing coughs and expelling phlegm), and to tonify the kidneys (which help reduce pain and weakness in the lower back). It is also an excellent tonic herb. Historically, it has been used for respiratory and lung disorders, and to reduce inflammation. Polygonatum can also applied topically to treat bruises, skin ulcers and boils, hemorrhoids, and edema.