How to determine whether phlegm comes from the lungs or the throat

The origin of phlegm—whether from the lungs or the throat—can be determined by analyzing coughing sounds, symptoms, and lung CT scans. The specific analysis is as follows:

1. Coughing sound

The throat belongs to the upper respiratory tract, while the lungs belong to the lower respiratory tract. When coughing up phlegm, if the phlegm originates from the lungs, it typically produces a relatively faint wheezing sound. If the phlegm comes from the throat, there is usually a clearer vocal cord vibration sound.

2. Symptoms

Phlegm generally forms when respiratory mucosa is irritated by inflammation. If the inflammation is located in the throat, the primary symptom is usually phlegm production. However, if the inflammation is in the lungs, additional symptoms such as chest pain and difficulty breathing may accompany the phlegm production.

3. Lung CT

If patients are unable to accurately determine the source of the phlegm through the above methods, they can visit a qualified medical institution for a lung CT scan to check for pulmonary infections. Once the exact cause is identified, targeted treatment can be administered.

Patients are advised to seek timely medical attention when experiencing discomfort to avoid delays in treatment. Regular full-body checkups are recommended in daily life.