What should I look for in a mattress if I am a side sleeper with back pain?

Side sleepers with back discomfort often do best on a mattress that keeps the spine in a straight line from neck to tailbone when viewed from behind. Look for a medium or medium-firm feel with enough cushioning at the shoulders and hips so they sink in slightly, but not so much that your midsection sags. Persistent pain should always be discussed with a healthcare professional.