Most of the pain in the chest from coughing for half a month is caused by pleurisy due to bronchitis or pneumonia. It should be noted that if the patient is accompanied by acid reflux, burping, belching, and burning sensation in the esophagus, it may also be caused by reflux esophagitis. And if the patient is elderly, has a history of smoking or has a family history of lung cancer, he or she needs to be alert to whether it is a precursor of lung cancer. For patients with underlying diseases such as hypertension, diabetes and coronary heart disease, it is also necessary to rule out heart disease and to improve the diagnosis by timely ECG and chest CT.