[JasminBerkova]

The pain, say a kidney pain, or a cancer patient's pain, or any other physical pain, lets assume that is not mine, how one will let it go?

you hit the nail

just the assumption 'that pain is not mine' is not enough to let 'it' go

you have to 'see' with wisdom 'that is not mine' then 'it' itself go or 'you let go of the pain'

to understand the difference between the 'assuming' and 'seeing' the pain, you have to meditate

meditate does not mean the concentration on breath or another object, but concentrate on 'your pain' and see what happen to it

in another post you said 'the pain is changing'

if the pain is yours, ask it to 'go away'

if it is yours, it should be listened to your orders