Laryngitis dry cough can be caused by chronic pharyngitis, acute pharyngitis, allergic pharyngitis, etc., respectively, due to inflammatory stimulation, pathogenic microbial infections and allergen exposure and other factors. 1. Chronic pharyngolaryngitis: patients with dry cough symptoms, mostly due to inflammatory factors and adverse physical and chemical factors caused by stimulation, will make the mucous membrane of the throat edema or congestion, easy to repeat the situation of persistent dry cough, but also may cause swelling and pain in the throat, itchy, secretion and other undesirable symptoms. 2. Acute pharyngolaryngitis: pharyngolaryngitis dry cough can also be caused by bacterial infection or viral infection, there will be more obvious pain around the throat, may be accompanied by fever, will cause limb weakness, aches and pains. 3. Allergic pharyngolaryngitis: exposure to allergens may also cause pharyngolaryngolaryngitis with a dry cough, accompanied by coughing up phlegm, itchy throat and other undesirable symptoms, and in severe cases may cause breathing problems or even dyspnea. It is recommended to go to the hospital for an examination to determine the cause of the symptoms.