You can lie in different positions to help clear your lungs. To help drain mucus from the sides of your lungs, lie on one side. Place two or three pillows under your hips. Use a small pillow under your head if it helps you feel more comfortable. Rest your arms where they are comfortable. Make sure your chest is lower than your hips. Take slow, deep breaths. Do this on both sides. Your doctor will tell you how long to lie on each side.