Cough and throat itching, sputum white thin, foamy, may be chronic bronchitis, interstitial pneumonia and other diseases.
1. Chronic bronchitis: chronic non-specific inflammation of the trachea, tracheal mucosa and surrounding tissues caused by infectious and non-infectious factors, bronchial secretions into the alveoli or airways, air-liquid mixture of white foamy sputum, when inflammatory secretions are discharged to the pharynx, throat, itchy, coughing, sputum symptoms.
2. Interstitial Pneumonia: Inflammation of the interstitial tissues of the lungs, the cause of which is unknown, mainly due to the leakage of pulmonary capillaries, exudate mixed with the air in the lungs to form a white foamy sputum, this disease has an insidious onset, chronic episodes of sputum discharge can be due to the sensitivity of the pharynx, triggered by coughing, pharyngeal itching and other symptoms.
When cough, throat itchy sputum white sparse foam at the same time, need to actively seek medical attention, systematic examination, in order to clarify the diagnosis.