There is always mucus inside the throat may be chronic pharyngitis, reflux pharyngitis, postnasal drip syndrome and other diseases. 1. Chronic pharyngolaryngitis: the onset of chronic inflammation of the mucous membrane of the pharyngeal cavity, resulting in increased secretion of the glands, which can also be accompanied by dry throat, itchy throat, pharyngeal foreign body sensation and other symptoms. So it may happen that there is always mucus inside the throat. 2. Reflux pharyngitis: gastric acid reflux to the throat may stimulate the mucous membrane of the throat to appear inflammatory reaction, resulting in repeated phlegm secretion in the throat, manifested in the case of always having mucus in the throat. 3. Postnasal drip syndrome: Nasal cavity, sinus lesions, increased secretion, postnasal drip, secretion will flow from the nasal cavity to the nasopharynx, and then flow to the throat position, appearing in the throat always have mucus situation. There is always mucus in the throat, and may be caused by nasopharyngitis, etc. It is recommended to actively seek medical attention to clarify the diagnosis and etiology, and standardize treatment in accordance with medical advice.