Itching inside the lungs may be caused by pneumonia, pleurisy, bronchial asthma and other causes. 1. Pneumonia: infection of the lungs by pathogenic microorganisms such as bacteria, viruses, mycoplasma, chlamydia, etc. leads to inflammatory lesions in the airways, alveoli, pulmonary capillaries and other tissues, which are often accompanied by fever, cough, sputum and other symptoms. 2. Pleurisy: Infection, autoimmunity, tumor and other factors lead to pleural exudation, adhesion and other inflammatory lesions, because the pleura is located on the surface of the lung, often accompanied by fever, cough, chest pain, dyspnea and other symptoms. 3. Bronchial asthma: after contact with airborne pollen, dust, willow floss, animal dander, hair, seafood and other allergens, the airways are stimulated to produce an allergic reaction, which is often accompanied by shortness of breath, shortness of breath, cough, chest tightness and other symptoms. Itchy inside the lungs may still be caused by other causes. Such as tuberculosis, lung tumors, it is recommended to consult a doctor for a clear diagnosis.