But dairy products, allergies, and eating dehydrating foods such as coffee, tea, and alcohol can also turn your mucus white. Acid reflux (also known as heartburn) or dry conditions may also be the ...

Phlegm color can indicate underlying health issues. Clear or white may signal allergies or viral infections. Yellow or green suggests bacterial infection, needing prompt antibiotic treatment.

The amount of thick, white sputum gradually increased to an estimated two cupfuls daily at the time of entry. Four years before admission she raised blood-streaked sputum for three days.