Hi welcome to Health care magic forum.
Your father is having pain on the left side of the stomach, just above the waist. It could be due to Benign prostatic hypertrophy
, urinary tract infection
, or uro lithiasis or could be some thing else.
I advise you to consult a surgeon for diagnosis and treatment. You may need to have M.R.I. besides other routine tests for confermation of the condition. Un less all the tests are done
and the patient is exained personally no one can suggest any medicines.
Wishing for a quick recovery, and thanks for choosing H.C.M.F.