The most common symptom of<unk>  is a chronic dry cough lasting more than 6–8 weeks.<unk>  is also defined by the increased number of eosinophils, a type of white blood cell, in the sputum compared to that of healthy people. As patients with asthma usually present with eosinophils in the sputum as well, some literature distinguish the two by classifying the condition as non-asthmatic<unk>  (NAEB) versus<unk>  in asthma. Non-asthmatic<unk>  is different from asthma in that it does not have airflow obstruction or airway hyperresponsiveness. Along with eosinophils, the number of mast cells, another type of white blood cell, is also significantly increased in the bronchial wash fluid of<unk>  patients compared to asthmatic patients and other healthy people. Asthmatic patients, however, have greater number of mast cells that go into the smooth muscle of the airway, distinguishing it from non-asthmatic<unk> . The increased number of mast cells in the smooth muscle correlate with the increased hyperresponsiveness of the airway seen in asthma patients, and the difference in the mast cell infiltration of the smooth muscle may explain why<unk>  patients do not have airway hyperresponsiveness.<unk>  has also been linked to other conditions such as COPD, atopic cough, and allergic rhinitis.
Eosinophilic bronchitis
Plastic bronchitis
Mineral dust airway disease
Acute eosinophilic pneumonia
Bronchiectasis
Eosinophilic pneumonia
Acute bronchitis
Diffuse panbronchiolitis