Phlegm in the throat may be clinically related to the following reasons: First, some patients have chronic pharyngolaryngitis, long-term lymphoid follicular hyperplasia of the posterior pharyngeal wall, the root of the tongue, the formation of secretions and the formation of phlegm after hyperplasia is particularly common in the clinic, especially when the patient loves to eat sweet, salty, and may be more pronounced after the drink of soup. Secondly, some patients have reflux gastritis and reflux esophagitis, in which gastric acid and other digestive enzymes reflux into the pharynx and form phlegm, which is often manifested as phlegm in the throat and repeated clearing of the throat, especially after meals. Third, some patients have pneumonia, bronchitis and other infectious diseases in the lungs, these diseases lead to the patient’s lungs, trachea has been inflammatory exudate, was coughed up to the throat to form sputum, sputum can be white sputum, can be yellow sputum, there can also be sputum with blood and other related performance. Fourth, some patients have chronic hypertrophic rhinitis, posterior group of sieve sinusitis, pterygoid sinusitis and other related diseases, long-term nasal mucus backflow into the pharynx to form phlegm, clinically can be accompanied by coughing, especially to stimulate choking cough and other symptoms are mainly clinically known as the upper airway cough syndrome. In short, if the patient always feel phlegm in the throat, it is recommended to go to ENT, respiratory medicine, gastroenterology and other related departments to see what exactly is the cause of phlegm in the throat.