What is the cause of significant pain in the left arm? [Solved]

When I woke yesterday morning, I could barely move my left arm. The pain is concentrated on my elbow and it's weird because when I went to bed the day before, I was alright. I'm confused. How could I have had this pain please?
Thanks in advance.
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2 replies

Best answer
Thank you
In fact, I do sleep like this and this must be the reason. I believe that I must change my sleeping position. Thanks for your help.

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Respond to Ushi
Thank you
This sounds like tennis elbow which occures due to lifting heavy weights or did you just sleep on your arm?
Is it the case?
Respond to Lian