What causes persistent phlegm sticking in the throat?

Under normal circumstances, persistent phlegm adhering to the throat may result from environmental dryness, insufficient water intake, chronic pharyngitis, sinusitis, or chronic bronchitis. If uncomfortable symptoms arise, it is advisable to seek timely evaluation and treatment at a reputable hospital. A detailed analysis follows:

1. Environmental Dryness

Long-term exposure to a dry environment causes rapid moisture loss from the pharyngeal mucosa, increasing the viscosity of mucosal secretions, which then adhere to the pharyngeal wall as sticky phlegm. To alleviate this, increase ambient humidity—e.g., by using a humidifier—and drink warm water regularly to maintain mucosal moisture.

2. Insufficient Water Intake

Inadequate daily fluid intake impairs normal dilution of pharyngeal and respiratory secretions, leading to accumulation and adhesion of viscous secretions in the throat. Establish a routine of regular hydration, ensure adequate daily water intake, and avoid prolonged mouth breathing.

3. Chronic Pharyngitis

Chronic irritation of the pharyngeal mucosa leads to persistent mucosal congestion and hypersecretion by glands, resulting in abundant thick phlegm adhering to the pharynx. Under medical guidance, medications such as Qinghou Liyan Granules, Yanyan Tablets, or Pudilan Xiaoyan Oral Liquid may be used; additionally, avoid exposure to dust and irritant gases in daily life.

4. Sinusitis

Inflammation of the sinus mucosa generates inflammatory secretions that drain retrogradely through the nasal cavity into the pharynx, persistently adhering there and causing a sensation of sticky phlegm or foreign-body discomfort. Under physician supervision, treatments may include mometasone furoate nasal spray, Tongqiao Biyan Capsules, or Eucalyptus-Citrus-Pinene Enteric-Coated Soft Capsules; severe cases may require functional endoscopic sinus surgery (FESS).

5. Chronic Bronchitis

Chronic airway inflammation in the bronchi triggers sustained secretion of viscous phlegm by bronchial glands; this phlegm migrates upward and adheres to the pharynx, producing a sticky or greasy sensation. Under medical guidance, medications such as ambroxol hydrochloride oral solution, acetylcysteine granules, or montelukast sodium tablets may be prescribed; for recurrent cases, bronchoscopic bronchoalveolar lavage may be considered.

In daily life, maintain well-ventilated and adequately humidified living environments, develop consistent hydration habits, reduce intake of spicy and irritating foods, avoid tobacco, alcohol, and harmful gases, and undergo regular respiratory health check-ups.