Why do I cough at night but not during the day?

Coughing at night without coughing during the day is a common clinical symptom, which is often caused by non-disease factors but may also be related to certain medical conditions such as cough-variant asthma or chronic bronchitis.

I. Non-disease Factors

Long-term smoking can irritate the respiratory mucosa due to harmful substances in tobacco, leading to pharyngeal mucosal congestion and edema, thereby causing symptoms such as cough and sputum production—especially more pronounced at night. It is recommended to change unhealthy habits, reduce smoking as much as possible, and prevent worsening of symptoms.

II. Disease Factors

1. Cough-Variant Asthma

The exact cause is not fully understood, but it is believed to involve interactions between genetic and environmental factors. The main manifestation is chronic cough. If allergic to certain materials in the bedroom, coughing may worsen at night. Typically, this condition does not present with wheezing, chest tightness, or shortness of breath. It is recommended to identify and eliminate triggers, and take medications such as methylprednisolone tablets, prednisone acetate tablets, or loratadine tablets under a doctor's guidance.

2. Chronic Bronchitis

This condition is usually caused by infectious or non-infectious factors leading to non-specific inflammation of the tracheal or bronchial mucosa and surrounding tissues. At night, seepage of mucus may irritate the mucosa, resulting in paroxysmal cough, sputum production, wheezing, and shortness of breath. It is recommended to quit smoking actively, avoid exposure to or inhalation of harmful gases and dust, and take medications such as levofloxacin hydrochloride capsules, ambroxol hydrochloride capsules, or theophylline sustained-release tablets as directed by a physician.

In addition, gastroesophageal reflux, pulmonary tuberculosis, heart failure, and other conditions may also cause the above symptoms. It is advisable to pay attention to daily adjustments and, when necessary, visit the respiratory department of a hospital for diagnosis. Cooperate with your doctor in undergoing appropriate examinations, determine the underlying cause, and follow medical advice for treatment.