Pollen
Dust mites
Mold
Pet dander
Certain environmental irritants
When the immune system reacts to an allergen, it can trigger inflammation and increased mucus production.
Other symptoms may include:
Sneezing
Itchy eyes
Runny nose
Nasal congestion
Throat irritation
If symptoms appear during a particular season or worsen in a specific environment, allergies may be contributing to your phlegm.
- Respiratory Infections
Colds, influenza, sinus infections, bronchitis, and other respiratory illnesses can temporarily increase mucus production.
During an infection, the immune system responds to invading viruses or bacteria, often resulting in inflammation and increased mucus.
Symptoms may include:
Cough
Congestion
Sore throat
Fatigue
Runny nose
Changes in mucus consistency
Mucus may also change color during an infection. However, mucus color alone cannot reliably determine whether an infection is viral or bacterial.
Most minor respiratory infections improve with time, rest, and supportive care.
- Acid Reflux and Silent Reflux
Acid reflux is another possible cause of chronic throat clearing and excess mucus sensation.
Some people experience laryngopharyngeal reflux, sometimes called silent reflux, without the classic burning sensation associated with heartburn.
