Hi,
Noted the history about a 64 years old male, working on self fishing boat not remembering any twist or trauma yet getting a
sharp pain on the right side under the ribs on back part, deep breathing hurts more.
The commonest causes I can think about are one of the following:
Prolapsed disc at back causing neurological problems.
Possible
Herpes or
Shingles, watch for the rash which may develop within a few days.
Kidney stone as one of your non-medical friend suggested.
This can be diagnosed by the following ways:
Consult your Doctor for clinical evaluation.
Ultrasonography of abdomen for kidney stones.
MRI of spine for discs, compressed
fracture of vertebrae and so on.
Neurological evaluation.
Once a diagnosis is made it will be easy to have proper management as per the cause.
Hope I have answered your query. Let me know if I can assist you further.
Regards,
Dr. T. Chandrakant, General Surgeon