Long-term dry cough can be caused by a variety of reasons, such as chronic pharyngitis, chronic bronchitis, tuberculosis, cough variant asthma, pneumoconiosis and other diseases can lead to long-term dry cough, and should not only be alert to the four causes, it is recommended that timely access to hospitals, by the doctor to check the details and clarify the cause of the disease and then targeted treatment. 1. Chronic pharyngitis: chronic pharyngitis patients due to the back wall of the pharynx is often more viscous secretion stimulation, can be manifested as a long-term dry cough, usually accompanied by sore throat, dry and itchy pharynx, pharyngeal foreign body sensation and other symptoms. 2. Chronic bronchitis: chronic bronchitis is a chronic non-specific inflammation, can be repeated acute episodes, gradual aggravation, the main symptoms of long-term dry cough, cough sputum, some patients may be accompanied by wheezing symptoms. 3. Tuberculosis: Tuberculosis is a chronic respiratory disease caused by Mycobacterium tuberculosis infection of the lungs, the common symptoms are long-term dry cough, cough sputum, hemoptysis, chest pain. 4. Cough variant asthma: cough variant asthma is a kind of special type of asthma with cough as the only or main symptom, and patients often show chronic persistent dry cough. 5. Pneumoconiosis: Pneumoconiosis is mainly caused by long-term inhalation of dust, diffuse fibrosis of lung tissue, the course of the disease is long, early symptomless, but with the development of the disease, can show dry cough, cough sputum, chest pain, dyspnea and other symptoms. There are common causes of dry cough, such as cough variant asthma, eosinophilic bronchitis, gastroesophageal reflux stimulation of cough, nasal secretion reflux stimulation of cough, it is recommended that timely hospital visits, with the doctor to improve the examination, standardized treatment.