White phlegm can be associated with a variety of conditions, and while it's not a typical symptom of gastroesophageal reflux disease (GERD), it can occur in some individuals with the condition. GERD primarily causes symptoms like heartburn, regurgitation, and difficulty swallowing. However, it can also lead to throat irritation or post-nasal drip, which may result in the production of phlegm.
Phlegm can also be indicative of respiratory issues, such as allergies, infections, or chronic respiratory conditions. If you're experiencing consistent phlegm production, particularly if it's accompanied by other symptoms like a cough, sore throat, or changes in appetite, it's best to consult a healthcare professional for an accurate diagnosis and appropriate treatment.