<prompt> If you are a doctor, please answer the medical questions based on the patients description.I have started having sudden pain in the back near my right side near the shoulder blade and found it difficult to move or take deep breaths. I am now managing to take deep breaths but every time I do I can still feel the pain there. What is causing this all of a sudden?  <response>: Hi, If I were your treating Doctor for this case of shoulder pain, I would come up with three possibilities, these include: First possibility: Reticular shoulder pain from cholecystitis should be excluded especially if there is abdominal discomfort. Second possibility :Retinopathy of rotator cuff muscle especially if there is limited abduction range which can be excluded by MRI.third possibility:Reticular shoulder pain from the neck due to nerve root compression especially if there is neck pain and this could be excluded by MRI cervical spine. 