Stubborn Phlegm and Old Phlegm are both names of diseases, and Old Phlegm is a kind of Stubborn Phlegm. In addition, stubborn phlegm also refers to phlegm that can obstruct the orifices of the heart and lead to epilepsy. Old phlegm refers to phlegm that is difficult to be cured due to the accumulation of qi and fire, and is also known as depressed phlegm, stubborn phlegm and knotted phlegm. Clinical symptoms manifest that there is something in the throat, which cannot be coughed up or swallowed. The treatment is to open up depression and reduce fire, clear the lungs and moisten dryness, and digest the condensed phlegm. The representative medicines for treating old phlegm are Qingdai, Semenxia, Gallus gallus, Cynanchum, etc. The representative formulae are Er Chen Tang, Bei Mu Gua Puzu San, etc. In addition to the symptoms of old phlegm, stubborn phlegm also refers to phlegm that blocks the heart and orifices and leads to epilepsy or delirium. The treatment should be to remove phlegm and open the orifices (to unclog the orifices and clear the mind by removing phlegm) to awaken the mind. Representative formulae include Rolling Phlegm Pill. The adverse effects of the above prescriptions are not known. If the above symptoms occur, one should go to the hospital for examination and standardize the use of medication under the guidance of the doctor.