3. Postnasal Drip
Postnasal drip occurs when excess mucus produced by the nasal passages and sinuses drips down the back of the throat instead of flowing out through the nose. This can cause persistent throat clearing and coughing, often first noticed in the morning after lying down overnight.
Common triggers for postnasal drip include seasonal allergies, viral infections, sinus infections, exposure to dust, and dry air. The sensation may feel like mucus is stuck in the throat or a tickling irritation that provokes coughing.
Symptoms
- Constant throat clearing
- Feeling of mucus accumulation in the throat
- Tickling or scratchy sensation
- Frequent coughing
What May Help
- Using saline nasal rinses or sprays to clear mucus
- Treating underlying allergies with antihistamines or nasal corticosteroids
- Staying well hydrated to thin mucus
- Using a humidifier in dry environments to maintain nasal moisture
4. Allergies
Allergic reactions to airborne substances such as pollen, dust mites, pet dander, and mold can stimulate the production of excess mucus in the nose and throat. This often leads to symptoms like nasal congestion, sneezing, and postnasal drip, which in turn causes morning phlegm and throat clearing.
Allergy symptoms tend to be seasonal or related to specific exposures. If you notice more mucus production during spring or fall, or after contact with pets or dusty environments, allergies may be an underlying cause.
Managing allergies with avoidance strategies, antihistamines, and nasal corticosteroids can reduce mucus production and improve symptoms.
5. Viral Infections
Viral respiratory infections such as the common cold, influenza, and COVID-19 frequently increase mucus production as part of the body’s immune response. The mucus may vary in color from clear to white, yellow, or green, but color alone does not distinguish between viral and bacterial infections.
These infections typically cause symptoms like sore throat, cough, nasal congestion, and fatigue, and they usually resolve with rest, hydration, and symptomatic care. Persistent or worsening symptoms beyond two weeks may require medical evaluation.
