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Possibly you have a strained tendon or ligament, but it is also possible that the weight of your body is too much for your shoulder muscles to easily bear. If you do not have trouble with your arm other than in this particular circumstance, then don't sleep on your side. Try a dorsal or ventral posture. One of those is very likely to work for you.

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11y ago
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Q: Why cant you lie on your right side because of pain in upper arm?
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