Acid Reflux and Phlegm: What's the Connection?

Acid reflux (GERD) occurs when stomach contents flow back into the esophagus, causing heartburn, regurgitation, sore throat, and swallowing difficulty. While reflux can irritate the throat and trigger a cough, it does not typically produce phlegm (thick mucus from the lower respiratory tract).

Phlegm is usually a sign of respiratory conditions such as:

• Colds, flu, or COVID‑19
• Allergies or post‑nasal drip
• Bronchitis or pneumonia
• Chronic obstructive pulmonary disease (COPD)

If you have both frequent reflux and phlegm, see a healthcare provider. They can determine whether you have overlapping GERD and a respiratory issue, or if "silent reflux" (laryngopharyngeal reflux) is contributing to throat irritation and mucus sensation. Accurate diagnosis guides proper treatment.