The pain may be a result of excessive fatigue
or it can be due to a decreased calcium levels.
He should check his calcium levels if it is below normal have 03 injections of vitamin D3
orally in 03 days and take calcium pills to compensate for the calcium.
Also check his uric Acid levels that can be increased and can cause pain in the joints.
If the uric Acid is higher than take Tab. Zyloric
100 mg once daily till the uric acid is normal and check for the uric Acid first after 15 days and then each month.
I hope I am successful in solving your query If you have more you can ask me.
Take care and have good rest.
Dr. Azhar Sattar