What are the causes of persistent dry cough?

Apr 20, 2023 Source: Cainiu Health

Dr. Guo Xiheng

Introduction

Persistent dry cough may result from prolonged exposure to overheated, dry indoor environments, which can irritate the throat mucosa and lead to dry coughing. It could also be caused by inhaling airborne substances such as pollen or dust, triggering a dry cough due to heightened airway reactivity. Additionally, it might stem from an acute bronchial infection, where inflammation causes congestion and swelling of the bronchial mucosa, resulting in a persistent, irritating dry cough.

Persistent dry cough may be caused by physiological factors, or it could result from pathological conditions such as allergies or acute bronchitis. A detailed analysis is as follows:

1. Physiological Factors

If one stays for a long time in an overly warm and dry indoor environment, the mucous membranes of the throat may become irritated, leading to dry coughing. This is generally considered a normal physiological phenomenon and can be improved by drinking an appropriate amount of warm water.

2. Pathological Factors

1) Allergies

Patients with an allergic constitution may inhale airborne substances such as pollen or dust, which, due to the airway's heightened reactivity, can trigger symptoms including dry cough and itching. It is recommended to take antiallergic medications such as cetirizine hydrochloride tablets, loratadine hydrochloride tablets, or montelukast sodium chewable tablets under medical guidance to control the allergic reaction and relieve symptoms.

2) Acute Bronchitis

After acute infection of the bronchi, inflammatory stimulation causes congestion and swelling of the bronchial mucosa, resulting in irritating dry cough. This may also be accompanied by increased sputum production. It is recommended to take anti-inflammatory medications such as cefixime tablets, amoxicillin capsules, or azithromycin dispersible tablets under medical supervision.

In addition, tuberculosis could also be a potential cause. If symptoms persist for a prolonged period and are accompanied by other discomforts, prompt medical evaluation is advised to avoid delayed diagnosis and treatment.

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Will COVID-19 cause a persistent dry cough for a long time?

COVID-19 usually refers to the novel coronavirus. After infection with the novel coronavirus, if proper medical treatment is promptly administered, persistent dry cough typically does not last very long. However, if treatment is delayed, secondary infections occur, or the individual has poor immune function, a prolonged dry cough may persist and recovery may be difficult. Coughing following novel coronavirus infection may be a protective reflex to expel secretions or could result from airway damage.

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What should be done for a child with persistent dry cough?

In general, persistent dry cough in children may be related to respiratory tract irritation, insufficient water intake, common cold, allergic cough, bronchitis, and other causes. It is recommended to seek medical attention promptly and follow the doctor's guidance for general treatment, medication, and other therapeutic approaches. It is also advised to maintain a light diet and reduce the intake of spicy, greasy, and other irritating foods to promote recovery.