Pain in the shoulder can be due to muscle strain.It can happen after inury.
Apply cold compresses on the shoulder by wrapping ice in a towel and applying it to the part.Give rest to your shoulder and take some non steroidal anti inflammatory analgesic(pain reliever) like ibuprofen or diclofenac.You can apply some muscle relaxant on the shoulder.
If the symptoms still persist then pls consult an orthopedician and get an x-ray done to check for any dislocations or fracture.
Hope it helps.Take care and pls do keep me posted on how you are doing.
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