Chest tightness, shortness of breath and cough are not necessarily lung cancer, but may also be caused by lung infection, bronchial asthma and other diseases. 1. Lung cancer: if patients suffer from lung cancer, it may press the airways around the tumor, leading to local lung lobe lesions and symptoms such as chest tightness, shortness of breath and cough. 2. Lung infection: when suffering from pulmonary heart disease, chronic bronchitis, emphysema, pulmonary tuberculosis and other diseases, due to long-term chronic inflammation, it leads to lung infection, resulting in increased resistance, chronic hypoxia, chest tightness, shortness of breath, coughing and other situations. 3. Bronchial asthma: If there is bronchial asthma disease, due to asthma attacks, there is a reversible airway contraction, affecting respiratory function, resulting in chest tightness, shortness of breath, coughing. Chest tightness, shortness of breath, coughing patients should go to the hospital in time, clear cause of the disease in the doctor’s guidance for appropriate treatment and therapy.