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Worried about mucus in your chest? (Mucus/Phlegm) Let's talk about the causes and remedies!

Dr. Priya Sammani (MBBS)
Medically Reviewed by Dr. Priya Sammani (MBBS) ✓ Medically Reviewed
📅 Updated: Jul 7, 2026 • ⏱ 8 min read • Editorial Policy
Worried about mucus in your chest? (Mucus/Phlegm) Let's talk about the causes and remedies!
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Phlegm is something we hear and experience all the time. In fact, our bodies naturally produce mucus all the time. So, having mucus is not a sign of illness. This mucus (also called 'Phlegm' when it forms in the respiratory system) covers the tissues in our nose, mouth, throat, and lungs. It cleans our nasal passages, keeps the tissues moist, filters out things like dust and bacteria that we breathe in, and protects us from infections. Think of it as a natural filter in our body.

Our bodies normally produce about a liter of mucus per day. However, if this amount of mucus increases, especially if it accumulates in places like the lungs, it can be a bit bothersome and may even be a sign of a health problem.

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Why does mucus increase like this? What are the reasons?

There are several main reasons that contribute to excess sebum production. Let's take a look at what they are.

Gastritis (Acid Reflux) and Mucus

If you have gastritis or acid reflux, stomach acid can flow back up into your throat. This can cause a sore throat, a runny nose, and postnasal drip. Symptoms include coughing, especially at night , frequent clearing of your throat, and frequent swallowing.

Allergies and allergies

Allergies can cause a variety of symptoms, from itchy eyes and sneezing to chest tightness and coughing. Especially if you have an allergy to something in the air, such as dust or pollen, your lungs can react. This causes excess mucus to build up in your nose and throat.

Asthma and phlegm

Asthma is a condition that causes difficulty breathing, chest tightness, and coughing with mucus. This means that your airways are inflamed, meaning they are swollen from the inside. However, if you cough up a small amount of white or colorless mucus, it is nothing to worry about.

Infections and phlegm

When we have infections like the flu, cold, acute bronchitis, and pneumonia, our airways produce more mucus. This mucus is coughed up and can be green or yellow . Although COVID-19 does not usually cause chest congestion, it can cause pneumonia as a complication.

COPD and smoking

COPD (Chronic Obstructive Pulmonary Disease) is a combination of several lung diseases, including chronic bronchitis and emphysema. It makes it difficult to breathe. In chronic bronchitis, the airways become inflamed and mucus production increases, making it difficult for the lungs to function properly. The main cause of this is prolonged exposure to things like cigarette smoke .

If you are a smoker, think about this especially. The nicotine in cigarettes causes the tiny hair-like structures in your lungs (called cilia) to become inactive for a while. Normally, these cilia are responsible for pushing mucus out of your lungs. So when they don't work, the mucus builds up and thickens. Because your body doesn't like this build-up of mucus, you have to cough constantly to get it out. This is what we call 'Smoker's Cough'.

Cystic Fibrosis

This is a rare, genetic condition that is present at birth. A defect in a protein in the body causes the body to produce thick, sticky mucus in the lungs and other organs. This can lead to blockages, infections, and damage to organs. Newborns are usually screened for this.

Things you can do at home to get rid of chest congestion

There are a few simple things you can do yourself to reduce phlegm.

When do you need to see a doctor?

If it's just mucus, it's not a big problem. But if you have the symptoms below, definitely see your doctor.

  • If the cough does not subside after a few weeks.
  • If the mucus is green or yellow .
  • If there is blood coming out with the mucus.
  • If you have a fever or difficulty breathing .

This chart will help you get a little idea of ​​what the color of your mucus says.

The color of the mucus What does that say?
White color You have congestion. The tissues inside your nose are swollen and mucus is starting to accumulate.
Yellow color The body is fighting an infection. This color appears when white blood cells go to the site of the infection and fight it.
Green The infection is mild. This color is caused by enzymes released by white blood cells. If you have green mucus for more than 10 days, see a doctor.
Pink or red The blood is a little mixed. When you have a stuffy nose, it could be due to the tiny blood vessels in your nose bursting. If there is a lot of blood, see a doctor.
Brown color It could be dried blood or something you've inhaled (dust, dirt). It could also be a sign of bronchitis, so it's a good idea to tell a doctor.
Black color It could be due to smoking or working in a dusty, dirty environment. However, although very rare, it could also be a sign of a serious fungal infection. So see a doctor.

Does honey relieve phlegm?

Yes, some studies have shown that honey can reduce mucus secretion. Honey can also help relieve sore throats and coughs. Honey has also been shown to be effective as a cough syrup for children.

Important: Do not give honey to babies under one year old. Although very rare, they can develop a dangerous condition called 'Infantile Botulism'. For adults, you can drink two teaspoons of honey straight or mixed into a tea.

💡 Take-Home Message

  • Mucus is a natural part of our body's defenses, but if it becomes too much, it can be a sign of a health problem.
  • Allergies, infections, gastritis (acid reflux), and especially smoking are the main causes of increased mucus.
  • Simple things like drinking plenty of water, inhaling steam, and keeping your head elevated while sleeping can help relieve the symptoms.
  • If your phlegm continues to be green/yellow, bloody, black, or has a fever and difficulty breathing, see a doctor immediately .
  • It is wise to consult your doctor before using any medication, even cough syrup.
Phlegm, Chest Mucus, Cough, Respiratory Diseases, Home Remedies, Asthma, Allergies

❓ FAQ

Frequently Asked Medical Questions (FAQ)

Evidence-based clinical answers to common patient questions

Why does mucus increase like this? What are the reasons?

There are several main reasons that contribute to excess sebum production. Let's take a look at what they are.

What should you know about Gastritis (Acid Reflux) and Mucus?

If you have gastritis or acid reflux, stomach acid can flow back up into your throat. This can cause a sore throat, a runny nose, and postnasal drip. Symptoms include coughing, especially at night , frequent clearing of your throat, and frequent swallowing.

What should you know about Allergies and allergies?

Allergies can cause a variety of symptoms, from itchy eyes and sneezing to chest tightness and coughing. Especially if you have an allergy to something in the air, such as dust or pollen, your lungs can react. This causes excess mucus to build up in your nose and throat.

What should you know about Asthma and phlegm?

Asthma is a condition that causes difficulty breathing, chest tightness, and coughing with mucus. This means that your airways are inflamed, meaning they are swollen from the inside. However, if you cough up a small amount of white or colorless mucus, it is nothing to worry about.

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⚠️ Important: Medical articles and information on Nirogi Lanka are strictly for educational and awareness purposes and do not substitute professional medical advice, diagnosis, or treatment. Always consult a qualified physician for any medical concerns.