The formation of pharyngolaryngitis may be caused by a combination of reasons, the common causes are pathogen infection, external environment, tobacco and alcohol stimulation and nasal inflammation stimulation, gastric acid reflux stimulation and so on. 1. Pathogen infection: viral infection is the most common, among which coxsackievirus, adenovirus and parainfluenza virus are the most common, in addition, bacteria such as streptococcus, staphylococcus and streptococcus pneumoniae can also induce laryngitis. 2. External environment, tobacco and alcohol stimulation: external dry air environment, smoke, dust, harmful gas inhalation stimulation can lead to the occurrence of this disease. Long-term smoking and excessive alcohol can also stimulate the throat and induce laryngitis. 3. Nasal inflammation stimulation: chronic inflammation of the nasal cavity, sinuses or pharynx, these parts of the inflammation can be directly extended to the larynx, but also due to nasal obstruction, the outside world air is not processed by the nasal cavity, long-term oral respiratory stimulation of the laryngeal mucosa leading to laryngitis. 4. Gastric acid reflux stimulation: gastric acid reflux stimulation leads to increased laryngeal secretions, frequent throat clearing, dry mouth, foreign body sensation in the throat, discomfort in swallowing, reflux of gastric contents, pain in the throat, chronic or recurrent coughing, dyspnea and so on. Laryngitis can also be caused by allergies and other reasons, if you have symptoms of throat discomfort, you should consult a doctor in a timely manner to clarify the cause of targeted treatment.