Just woke up in the middle of the night. Had a weird pain start under my left shoulder (I was laying on my left side). Pain slowly grew until it got very uncomfortable (I got out of bed and paced the room). Felt like a dagger was being wedged under my left shoulder creating constant discomfort deep in the center of my torso. I had no shortness of breath. After a few minutes it subsided...although my left arm felt a little tingly. 43 year old male. Been doing a lot of international flights.
Hello, Side sleeping may cause rotator cuff injury, or it may be a muscular pain or nerve compression like median nerve at elbow or radian nerve at radial groove. Use three pillows while side sleeping. Use diclofenac twice a day for five days. If no improvement you may consult with your physiotherapy he will examine and treat you accordingly. Take care. Hope I have answered your question. Let me know if I can assist you further.