Recording to your sign and symptom your uncle is suffering from muscular pain of the shoulder.
In this case your uncle can take as a treatment some muscle relaxant with
calcium and multivitamin.
Tablet - flexon Mr two time per day after food and
Cap - Omez ones one time and
Tab Calcium one time and
multivitamin 2 time.
Next Steps
according to me your uncle should take consultation once time for best treatment.
Health Tips
your uncle should do some exercise with yoga and meditation for strength of shoulder.