Drink plenty of water
Sip warm fluids
Use steam inhalation
Gargle with warm salt water
Try honey
Use a humidifier
Blow your nose gently
Cough up phlegm instead of swallowing it
Avoid smoking
Avoid secondhand smoke
Avoid dust and strong fumes
Rest adequately
Use saline nasal spray
Elevate your head while sleeping
Eat spicy foods if tolerated
Seek medical care if phlegm is persistent, bloody, or accompanied by trouble breathing or high fever