The pharynx does not close during exhalation, and there is no scientific evidence that the pharynx closes during exhalation.
The pharynx is a tubular cavity connecting the mouth, nose and lower respiratory tract, which is not only a channel for airflow in and out during breathing, but also contains rich glands in or under the pharyngeal mucosa, which has the effect of regulating the temperature, humidity and cleansing of the inhaled air.
During exhalation, the air in the lungs is squeezed and passes from the bronchial tube through the trachea, and enters the larynx and pharynx through the vocal folds, and is then discharged out of the body through the mouth and nose. During this process, the pharynx is open. If the pharynx is closed due to pathological or physiological factors, this ventilation cannot be accomplished, resulting in breath-holding symptoms.
When you feel discomfort in your throat when you exhale, you need to actively seek medical advice and standardized diagnosis and treatment, and you can consult an ear, nose and throat specialist for relevant medical knowledge.