Phlegm and mucus in the throat
Mucus felt in the throat may come from the airways or from nasal drainage. Both nasal and chest symptoms are considered.
What to know first
Sticky mucus, frequent throat clearing or phlegm produced with a cough.
When to see a clinician
Seek advice for persistent phlegm or cough, blood, continuing fever, chest pain or weight loss.
Why sinusitis and postnasal drip can feel like phlegm
Mucus from the nose and sinuses can run into the throat and cause a sticky sensation or throat-clearing. This is postnasal drip. It can be difficult to distinguish from mucus produced in the lungs by sensation alone. Colour alone cannot determine the cause or the need for antibiotics.
ENT assessment considers nasal blockage, discharge, smell changes and throat findings. Persistent cough, wheezing, breathlessness or blood in sputum may need respiratory or internal-medicine evaluation and chest investigations elsewhere. Severe breathlessness, substantial bleeding or chest pain needs emergency care.
Possible causes
Rhinitis, sinusitis and airway conditions can contribute. Smoking and environmental irritation may be relevant.
Examination and tests
We review the source and pattern of mucus and examine the relevant areas. Chest symptoms may require assessment by another specialty.
Tests are selected according to your symptoms and examination. Specialist tests or procedures may require referral.
Treatment
Treatment targets the cause. Medicines that help clear mucus may be considered, but discharge colour alone does not determine the need for antibiotics.
These are general treatment options. Your clinician will discuss which approach fits your condition; not every treatment described is provided at this clinic.
What you can do at home
Maintain fluids unless advised to restrict them, avoid smoke and report blood or a change in breathing.
Frequently asked questions
Does coloured phlegm always need antibiotics?
No. The overall symptoms and examination determine whether antibiotics are appropriate.
What should I tell the clinician?
Tell us when symptoms began, whether they are changing, your medicines and allergies, and any relevant medical conditions. For a child, describe changes in feeding, sleep or response to sound.
Does morning phlegm mean I have sinusitis?
Secretions can collect overnight, but asthma and other respiratory conditions can also cause morning symptoms. The pattern, duration, nasal symptoms and breathing symptoms must be assessed together.
Related symptoms and conditions
Air quality and respiratory symptoms
Visiting Honda ENT Clinic
Check temporary changes
| Day | Morning | Afternoon |
|---|---|---|
| Mon / Tue / Wed / Fri | 9:00–12:30 | 15:00–18:20 |
| Saturday | 9:00–11:00 | 14:00–16:00 |
| Closed | Thursday, Sunday and public holidays | |
Reception opens 15 minutes before each session. Walk-ins are welcome for general consultations. Vaccinations may require an appointment.
Please call before visiting if you have a fever of 37.5°C or higher, a recent positive infection test, a household member with an infection, or would like infection testing. The waiting-time service is in Japanese.
Schedules can change. Check clinic news or call before travelling.
About this information and references
This information is published by Honda ENT Clinic and is intended as general guidance. Individual diagnosis and treatment require a clinical assessment. Updated: 15 October 2026.
About Medical Director Dr. Yusuke Honda