My husband has a pain in his side that is
It could be musculoskeletal pain
As per your description,it looks like Musculoskeletal pain.Tablet containing Thiocolchicoside will help.
If there is no response, Ultrasound abdomen has to be done.Right sided Kidney stone/Ureteric stone has to be excluded.
Nothing to worry
Hope I answered your query.If you have any questions,I will clarify further.
Wish him good health