1. warm up the shoulder part properly 1st before the main workout like shoulder press. ( i suggest go search shoulder warm up exercise for the rotator cuff )

2. when doing the press dont lock out fully like an " l " shape at the top.

or maybe you have some previous injury or whatever that may have trigger the pain or whatever i dont know la.. but try the 2 tips above 1st

and ofcourse all this i just assume u know the form on how to do this la.. good luck ts hope it help

u need to look for expert for help already if like that..

if you do it without weight does it still pain though? if yes then look for expert help

i would say go with the 2 advice above too... try the way Amedion said for a couple week and dont lift heavy or dont do the shoulder press at all atm..

theres alot we dont know about... like do you always have pain when doing the shoulder press or just recently? or maybe you had shoulder injury b4 that you neglected..