Phlegm in the throat all the time is common in chronic inflammatory diseases such as chronic pharyngitis, chronic laryngitis, bronchitis, etc. It is less likely to get cancer. Patients should seek timely medical consultation and examination to clarify the cause of the disease. The symptom of phlegm in the throat is more common in otolaryngology clinics and is mostly seen in chronic pharyngitis, which is caused by chronic inflammation of the mucous membrane in the throat and increased secretion of mucus glands, resulting in more phlegm. If the patient has phlegm in the throat all the time and can cough up a small amount of phlegm, and the examination shows a little phlegm adhering to the mucous membrane of the throat, oral lozenges can be taken to relieve the symptoms. If there is pus phlegm, it is mostly considered to be caused by bacterial infection and needs anti-infection treatment. Although the possibility of cancer from phlegm in the throat is low, it should be taken seriously because if inflammation exists but is not controlled in time, repeated chronic irritation may induce local cancer. Usually, phlegm in the throat is not cancer, so patients do not need to worry too much. However, if there is blood in sputum for a long time and there is a long history of smoking, it may be an early symptom of respiratory tract cancer, so patients should visit respiratory department in time.