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Phlegm doesn’t just show up randomly—it’s your body reacting to something. Medically, it’s mucus produced by your respiratory system, and it usually increases when your body is trying to protect or clear your airways.
Here are the most common reasons:
1. Infections
Colds, flu, or respiratory infections like Bronchitis or COVID-19 can trigger excess phlegm. Your body produces more mucus to trap and remove viruses or bacteria.
2. Allergies
Things like dust, pollen, or pet dander can irritate your airways, causing mucus buildup.
3. Smoking or air pollution
Exposure to smoke or polluted air irritates the lungs, leading to more phlegm production as a defense mechanism.
4. Chronic conditions
Diseases such as Asthma or Chronic Obstructive Pulmonary Disease often involve ongoing mucus production.
5. Post-nasal drip
When mucus from your sinuses drains down the back of your throat, it can feel like phlegm.
6. Dehydration or thick mucus
Not drinking enough fluids can make mucus thicker and more noticeable.
When to pay attention:
If your phlegm is persistent, very thick, foul-smelling, or mixed with blood—or if you also have fever, chest pain, or breathing issues—it’s worth getting checked by a doctor.
If you want, tell me your symptoms (color of phlegm, how long, any cough/fever), and I can help narrow down the likely cause.
