Hello and thanks for posting,

The chest wall area has many muscles and nerve endings that can get inflamed or irritated. Do try some daily gentle stretching exercises, and think about how you are sleeping position wise, as sometimes this can cause issues. Try and avoid heavy lifting on that side. Maybe consider a private physiotherapy assessment. 

Most of the time these things resolve over a few weeks, if it persists then make a GP appointment. They can also refer for NHS physiotherapy if needed.

They will advise you if they want to do any other tests or scans, or an x-ray.

Hope this helps,

Best wishes,

Vanda