Constant mucus or the feeling of phlegm stuck in the throat is common and can have several causes. It’s often described as postnasal drip, where excess mucus from the nose or sinuses drains down the back of the throat.
Some of the most common causes include:
- Allergies – pollen, dust mites, pet dander, or mold can increase mucus production.
- Viral infections – colds and other respiratory viruses often cause temporary excess mucus.
- Sinusitis – inflamed or infected sinuses can lead to persistent drainage.
- Acid reflux (GERD or laryngopharyngeal reflux) – stomach acid reaching the throat can cause a sensation of mucus, frequent throat clearing, or hoarseness, even without heartburn.
- Environmental irritants – cigarette smoke, air pollution, strong fragrances, or dry air can irritate the airways.
- Certain medications – in some people, medications can contribute to throat irritation or cough.
- Less commonly, chronic lung conditions or structural issues may play a role.
What may help
- Stay well hydrated to keep mucus thinner.
- Use a saline nasal spray or rinse if nasal congestion or allergies are contributing.
- Avoid smoking and secondhand smoke.
- If reflux is suspected, avoid large late-night meals and identify foods that trigger symptoms.
- Manage allergies if they’re a known issue.
When to seek medical evaluation
See a healthcare professional if you have:
- Symptoms lasting more than 3–4 weeks without improvement.
- Difficulty swallowing or breathing.
- Coughing up blood.
- Unexplained weight loss.
- Fever, severe facial pain, or foul-smelling nasal discharge.
- Persistent hoarseness lasting more than 2–3 weeks.
If you tell me your age, how long you’ve had the mucus, and whether it’s accompanied by heartburn, nasal congestion, cough, or throat clearing, I can help narrow down the most likely causes.
