Adults dry cough without sputum throat itch is likely to be chronic pharyngitis, acute bronchitis, lung cancer, cough variant asthma. 1. Chronic pharyngitis: this disease is a chronic inflammatory disease of the throat, the pathological manifestations of the pharyngeal mucosa chronic congestion, edema, mucosal lymphoid tissue hyperplasia forming lymphoid follicles. Patients often have a burning sensation in the pharynx, foreign body sensation, itching, dryness, sometimes accompanied by mild pain, usually after the cold and morning after the irritating dry cough aggravated. 2. Acute bronchitis: the disease starts rapidly, often with symptoms of upper respiratory tract infection, followed by irritating cough or with a small amount of mucous sputum. Some patients’ cough lasts more than 30 days. 3. Lung cancer: it is often irritating dry cough, which can be aggravated when bronchial stenosis occurs. It is mostly persistent, with high-pitched metallic cough or irritating choking cough. 4. Cough variant asthma: manifested as irritating dry cough, violent cough, heavy cough at night. Cold air, dust, fumes and other factors easily triggered. Usually there is a history of recurrent coughing, coughing or aggravation at night or early in the morning. Adults dry cough without sputum throat tickling can also be seen in idiopathic pulmonary fibrosis, tuberculosis, bronchial masses and other diseases, this symptom needs to consult a doctor in time, after the cause is clear and active treatment.