Coughing up phlegm in the throat may be due to chronic bronchitis, chronic pneumonia, chronic pharyngitis and other reasons, according to the possible diseases need to choose the targeted examination, such as: chronic bronchitis can go to the hospital for chest X-ray examination, chronic pneumonia can go to the hospital for chest CT examination, chronic pharyngitis can be used for electronic laryngoscopy examination. 1. Chronic bronchitis: chronic bronchitis can go to the hospital for routine blood tests, biochemical tests, pulmonary function tests, chest X-ray or chest CT. 2. Chronic Pneumonia: Chronic Pneumonia can be examined in the hospital with routine blood test, blood sedimentation test, chest CT, sputum culture and MRI. 3. Chronic pharyngitis: Chronic pharyngitis can be examined by blood biochemistry, electronic laryngoscopy, neck ultrasound and neck CT in the hospital. It is recommended that patients actively seek medical treatment after symptoms appear, and follow the doctor’s instructions to standardize the examination to clarify the diagnosis.