There are more factors for patients to cough up a thread-like sputum, which may be caused by the following factors: 1. bacterial infection in the trachea or lungs, which leads to coughing up a thread-like sputum; 2. viral infection in the lower respiratory tract, which leads to the above symptoms; 3. fungal infection in the lungs, which may also lead to thread-like sputum; 4. inflammation in the throat and other parts, which may also lead to coughing up sputum, if the coughing up sputum is not If the coughing is not serious, there may be thread-like sputum. Generally, Chinese medicine believes that coughing up thread-like sputum is a cold cough caused by wind and cold invading the lungs. Patients with this symptom should go to the hospital for a lung X-ray to clarify the cause, and if it is caused by an infectious disease, active treatment with antibiotics, antiviral or antifungal drugs is required.