Cough

Cough: Protective Reflex of the Airways

Cough is one of the most common symptoms that brings people to a doctor. It is a complex protective reflex act, whose main goal is to clear the airways of anything that may obstruct them: from mucus and phlegm to dust and foreign bodies. It is important to understand that cough is not a disease, but merely a manifestation of one. Effective treatment lies not in "suppressing" the cough at any cost, but in identifying and eliminating its underlying cause.

Mechanism of the Cough Reflex

The coughing act is a powerful, coordinated process. Specialized receptors in the mucous membrane of the airways (throat, trachea, bronchi) respond to mechanical or chemical irritation. They send a signal to the "cough center" in the brain, which in turn triggers a cascade of reactions: a deep inhalation, closure of the glottis, tension of the abdominal and chest muscles, and finally a sharp, explosive exhalation that creates a strong airflow.

Dry vs. Wet Cough: What’s the Difference?

The nature of the cough is an important diagnostic key:

• Dry (non‑productive) cough: Characterized by the absence of phlegm. It is often persistent, "tickling", exhausting. It usually indicates irritation or inflammation in the early stages, when mucus has not yet formed. Causes can include the onset of a cold, allergy, inhalation of irritants, gastroesophageal reflux (GERD) or side effects of certain medications.
• Wet (productive) cough: Accompanied by the expectoration of phlegm. This indicates that the airways are clearing accumulated mucus. It most commonly occurs with bronchitis, pneumonia and in the later stages of a cold.

In children, cough may have specific features, such as a "barking" cough with whooping cough. More details can be found in the article "Cough in Children". Cough is often accompanied by runny nose and sore throat.