Chronic Cough, The Cough That Won't Stop

1. The cough has ended, so why am I still coughing?

Initially, it was due to a cold. My nose was stuffy, my throat was sore, and I had a fever, which was followed a few days later by a cough with phlegm. But the fever subsided, and my throat pain disappeared, yet the cough wouldn't stop. My doctor said my lungs were clear, and allergy tests showed nothing unusual. It's often dismissed with "It seems like your cold is lingering," but at night, I often wake up coughing, my voice gets hoarse just from talking, and once a cough starts, it doesn't easily stop. Is this just a lingering effect of a cold? Or has some structure in my body changed?

2. From Acute to Chronic — The Turning Point of a Cough

Acute cough is mostly caused by infections. Viruses cause inflammation in the upper respiratory tract (nasal cavity, pharynx, larynx), which leads to increased mucus or inflammatory mediators stimulating cough receptors. In such cases, a cough is a direct response to inflammation, and a "real irritant" in the form of secretions is present. However, the problem arises when the cough persists for more than 3 weeks or 8 weeks. At this point, the cough is no longer a "response to an irritant" but a "reflex loop triggered without irritation." There may be no actual mucus, and lung function might be normal, yet the cough continues. This is called cough hypersensitivity syndrome, which refers to a state where the sensitivity of peripheral C-fibers that trigger coughing increases, and the cough inhibitory circuit in the central nervous system is neutralized. In this state, even mild smells, cold air, or simply talking can trigger a cough.

3. From Postnasal Drip to UACS — The Evolution of Interpreting Unexplained Coughs

In the past, doctors called such chronic coughs 'Postnasal Drip Syndrome'. The theory was that mucus produced in the upper respiratory tract flowed down the back of the pharynx, irritating the larynx and causing a cough. This diagnosis seemed plausible because many patients reported "something flowing down my throat" or "a constant feeling of phlegm." However, in many cases, endoscopic or imaging tests did not clearly show mucus flow, and many patients with abundant mucus had no cough at all. Cough induction was more about a 'sensation' than the actual presence of mucus, and this began to be recognized as a problem related to sensory nerve hypersensitivity. In 2006, the American College of Chest Physicians (ACCP) recommended adopting the term Upper Airway Cough Syndrome (UACS) instead of Postnasal Drip Syndrome. This term reflects that various states of sensory hypersensitivity in the upper airway (such as rhinitis, sinusitis, and allergic rhinitis), not just mucus flow, can be causes of chronic cough.

4. Other Discomforts Caused by Repetitive Coughing

Coughing itself is distressing, but when it becomes repetitive, it severely diminishes the quality of life. There's a persistent foreign body sensation in the throat, a habit of clearing the throat develops, the voice becomes hoarse, and the vocal cords fatigue easily. Some patients complain of chest pain, intercostal pain, and abdominal pain during coughing, and in female patients, stress urinary incontinence may also accompany it. Above all, sleep quality deteriorates, and coughing bursts out even during ordinary conversations, making individuals conscious of others' glances. Since COVID-19, coughing in public places itself can cause anxiety and social withdrawal. A cough is not just a symptom; it becomes a structural phenomenon that creates complex physical, psychological, and social repercussions.

5. From the Failure of Suppression to the Sensation of Recovery

Many people consider a cough a "symptom to be suppressed." However, chronic cough cannot be controlled by simple suppression. The reason painkillers or antitussives and expectorants don't work is that this cough isn't due to irritation, but a malfunction of the sensory circuit itself. Therefore, the focus of treatment must now change. Not "what to suppress," but "how to lower the sensory input again." Creating conditions for recovery is key. This includes posture, hydration, laryngeal stabilization, autonomic nervous system balance, and psychological stability. Restoring the sensory threshold requires complex and structural adjustments rather than simple medication.

6. A Cough Is Not a Sound, But a Structure of Sensation

A cough is a signal from the body. But when that signal becomes repetitive, fixed, and uncontrollable, it becomes a fixed sensory structure. At this point, we need not simply "eliminate" that signal, but rather "make an effort to re-tune it." Your cough may not be your lungs, but your sensory system trying to communicate. Understanding why it hasn't stopped, rather than forcibly stopping that signal, is the true starting point of recovery.