Why does my shoulder hurt when sleeping on my side?

Reviewed by Yoshinori Abe, MD

Internal Medicine

Side sleeping is a common cause of shoulder pain. When you lie on your side, your entire upper body weight compresses the shoulder joint for hours at a time. This sustained pressure can irritate the rotator cuff, inflame the bursa, and strain the surrounding tendons and muscles.

Over time, this repeated stress may lead to conditions like rotator cuff tendinitis, shoulder impingement, or bursitis — all of which can cause pain that lingers well beyond the morning.

Because shoulder pain from side sleeping can overlap with more serious underlying issues, it's worth understanding what's actually driving your discomfort. A free, instant, online symptom check can help you identify possible causes based on your specific symptoms and guide you on the smartest next steps — whether that's adjusting your sleep position, trying targeted stretches, or seeing a doctor.

Reviewed for medical accuracy: 07/20/2026

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Explanation

Sleeping on your side might hurt your shoulder because it puts extra pressure on the shoulder joint. This position can increase pressure in the area called the subacromial space, which is part of your shoulder.

Pressure and Pain: When you lie on your side, the weight of your body presses down on your shoulder, which can lead to discomfort and pain. This pain might be more noticeable if you stay in the same position for a long time.
Rotator Cuff: The rotator cuff is a group of muscles and tendons that help move and stabilize your shoulder. Sleeping on your side might affect these tendons, especially if there is already a tear or damage, leading to more pain.
Finding Relief: If your shoulder hurts when you sleep on your side, you might try sleeping on your back or using a pillow to support your shoulder. For persistent shoulder pain that's affecting your sleep quality, consider using a free symptom checker to better understand what might be causing your discomfort and when you should seek medical attention. This can help reduce the pressure and make you more comfortable.

(References)

Zenian J. (2010). Sleep position and shoulder pain. Medical hypotheses, 20036076.
Richards DP, Miller DL, MacDonald ED, Stewart QF, & Miller SD. (2024). Rotator Cuff Tears Are Related to the Side Sleeping Position. Arthroscopy, sports medicine, and rehabilitation, 38328528.
Werner CM, Ossendorf C, Meyer DC, Blumenthal S, & Gerber C. (2010). Subacromial pressures vary with simulated sleep positions. Journal of shoulder and elbow surgery, 20656524.

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