Dry cough without sputum and chest tightness may be related to pneumonia, tuberculosis, lung cancer and cardiac insufficiency. 1. Pneumonia is the most common cause. Lung infections can affect the mucous membranes of the trachea and bronchial tubes, resulting in dry cough and chest tightness. 2. Tuberculosis, dry cough is a typical symptom of tuberculosis, and chest tightness may appear in acute stage. 3. Lung cancer, due to the compression of trachea and bronchial tubes by malignant tumor, dry cough and chest tightness may appear. 4. Cardiac insufficiency, mainly refers to heart failure, due to heart circulation disorder, dry cough and chest tightness may appear. At the same time do not exclude other diseases may, need to consult a doctor in a timely manner after the examination to clarify the cause of the disease, and at the same time under the guidance of the doctor to carry out the relevant treatment.