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What causes thick phlegm in the throat?

Jan 25, 2025 Source: Cainiu Health
Dr. Lu Cheng
Introduction
Under normal circumstances, thick phlegm in the throat may be caused by increased mucus secretion, weakened swallowing function, chronic pharyngitis, sinusitis, bronchitis, or other similar reasons. To prevent this symptom, it is recommended to maintain humid indoor air, use a humidifier, and avoid irritation of the throat mucosa caused by dry air. At the same time, maintaining good living habits can enhance the body's resistance.

Generally speaking, the throat refers to the pharynx. Thick phlegm in the throat may be caused by increased mucus secretion, weakened swallowing function, chronic pharyngitis, sinusitis, bronchitis, and other factors. If discomfort occurs, timely medical consultation is recommended. Detailed analysis is as follows:

1. Increased Mucus Secretion

The mucous membranes of the throat secrete mucus to maintain moisture and protect against external irritants. When exposed to environmental irritants, the mucosa may overreact and secrete excessive mucus, leading to thick phlegm formation. Measures include maintaining indoor air humidity using humidifiers, avoiding prolonged exposure to polluted environments, and drinking plenty of water to dilute mucus.

2. Weakened Swallowing Function

In elderly individuals or those with neurological disorders, swallowing function may decline, preventing timely clearance of phlegm from the throat through swallowing or coughing, resulting in accumulation of thick phlegm. Management includes swallowing exercises to strengthen pharyngeal muscle strength, and dietary adjustments to avoid overly hard or sticky foods.

3. Chronic Pharyngitis

Chronic pharyngitis may result from recurrent acute pharyngitis, upper respiratory tract infections, or long-term irritation from smoking and alcohol consumption. Persistent inflammation of the pharyngeal mucosa leads to increased secretions that become viscous. Symptoms may include a foreign body sensation, dryness, and mild pain in the throat. Treatment options under medical guidance include compound borax mouthwash, nitrofural adhesive patches, and Yinhuang tablets.

4. Sinusitis

Sinusitis may be caused by upper respiratory tract infections, nasal anatomical abnormalities, or allergic reactions. Mucus from the sinuses flows through the posterior nasal aperture into the throat, causing thick phlegm. Associated symptoms may include nasal discharge, headache, and reduced sense of smell. Treatment under medical supervision may involve budesonide nasal spray, amoxicillin-potassium clavulanate, and eucalyptol enteric-coated capsules.

5. Bronchitis

Bronchitis may be triggered by infections such as viruses, bacteria, or mycoplasma, or by exposure to cold air and dust. Inflammation of the bronchial mucosa increases secretions, which become purulent due to infection. Symptoms may also include coughing, wheezing, and fever. Under medical advice, treatment may include ambroxol hydrochloride oral solution, cefixime dispersible tablets, and theophylline sustained-release tablets.

To prevent this symptom, it is recommended to maintain indoor air humidity with humidifiers to avoid dry air irritating the throat mucosa. Additionally, maintaining healthy lifestyle habits can enhance the body's resistance.

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