Will a foreign object entering the nose reach the lungs?

Generally speaking, whether a foreign object entering the nose can reach the lungs depends on the specific circumstances. If the foreign object is intercepted by the nasal cavity's defense mechanisms, it usually does not reach the lungs. However, if the foreign object bypasses the nasal defenses, it may enter the lungs. A detailed explanation is as follows:

The nasal cavity contains nasal hairs that can block larger foreign objects, such as dust and larger particles, preventing them from entering deeper into the nasal passages. Additionally, the nasal mucosa secretes mucus that can trap smaller foreign objects. Through the movement of cilia, these trapped objects are transported toward the front of the nasal cavity and eventually expelled from the body through coughing up phlegm or blowing the nose.

If a foreign object bypasses the nasal defense mechanisms, it may enter the trachea and lungs. The object can be carried by inhaled airflow into the throat, and if the protective reflexes of the larynx fail to expel it, the object may enter the trachea. Once in the trachea, it might continue to move downward and eventually reach the lungs. However, larger foreign objects typically do not make it into the lungs.

In daily life, if a foreign object enters the lungs, it may obstruct the trachea or bronchi, causing impaired ventilation in parts of the lung and potentially leading to breathing difficulties. Even small foreign objects can trigger inflammatory responses in the lungs and lead to infections. It is advisable to eat slowly and chew food thoroughly to avoid accidental inhalation and its associated complications.