Drink warm fluids
Gargle with salt water
Stay well hydrated
Use steam or inhale warm steam
Try honey in warm water or tea
Clear your throat gently
Cough lightly to bring up mucus
Use a humidifier
Avoid smoking and secondhand smoke
Avoid dairy if it seems to worsen mucus
Sleep with your head elevated
Use saline nasal spray
Treat allergies or postnasal drip
Use over-the-counter expectorants if appropriate
See a doctor if phlegm is persistent, bloody, or comes with trouble breathing