A persistent cough is a symptom more commonly associated with respiratory diseases. These include infectious factors, such as infection by Mycobacterium tuberculosis, mycoplasma, chlamydia, fungi, and leptospira and parasites, which cause an inflammatory response in the lungs. In addition, non-infectious pulmonary factors, such as cough variant asthma, a specific type of bronchial asthma, and diffuse fibrosis of the interstitial lung, are also seen in eosinophilic pneumonia. Clinically, blood tests can be performed, respiratory secretions can be taken, pathogen cultures can be done, CT of both lungs can be taken, lung function can be measured and even allergens can be measured to clarify the above possible diagnosis and standardize treatment in a timely manner.